The Replacements

A fictional pro football league finds themselves hit with a players' strike with the season still needing to be finished. Washington Sentinels[1][2] owner Edward O'Neil calls a former coach of his, Jimmy McGinty, telling McGinty that he and the rest of the teams are going to finish the final four games of the season with replacement players. O'Neil asks McGinty to coach the Sentinels the rest of the season, along with the pressure of winning three of the last four games to make the playoffs. McGinty accepts, on the condition that he will also be given the freedom to sign the players he wants, with O'Neil not allowed to interfere.
With O'Neil accepting, McGinty builds his team of different varying players that he believes he can make a winning team. As his quarterback, he chooses Shane Falco, a former All-American from Ohio State who's career went to pieces after a horrendous Sugar Bowl game, and now lives in a houseboat near the Sentinels' stadium. Falco initially refuses, but McGinty convinces him, believing that Falco can still be the player he was meant to be. The replacement players are greeted to their first practice hostilely by the striking players, calling the replacements "scabs", and throwing eggs at them, and Falco, who arrives late, gets his truck turned over. After practice, head cheerleader Annabelle Ferrell, who has to find new cheerleaders, since the originals apparently went on strike as well, and reluctantly hires strippers when the other tryouts go terribly bad, drives Falco home, and surprises him with her vast football knowledge.
The replacements' first game is against Detroit, and the team initially struggles to get along, causing the Sentinels to fall behind early. Falco tries to rally the team back, but on the last play, he panics when he sees a pending blitz and calls an audible, which falls short of the winning touchdown. McGinty berates Falco for what he did, telling him that "winners want the ball when the game's on the line." At a local bar, several of the replacements lament over their loss, when several of the striking players, led by their prima donna quarterback Eddie Martel, arrive and taunt the replacements. When Falco stands up to Martel, a brawl follows, leading to the replacements being arrested, but they build a bond in the process, dancing together in their cell before McGinity bails them out. Annabelle meets Shane the next day, having heard what happened, and tells him that he's the first quarterback she's seen in a long time be so selfless, and a connection starts to grow with the two of them.
In the Sentinels' next game, against San Diego, they fall behind again, but are able to come together once again, and this time, win, on a 65-yard field goal by their kicker, a Welsh soccer player named Nigel Gruff. Falco meets Annabelle again, where she runs a bar her father used to own, and admits that she was raised with football. After sharing a short conversation and having a beer together, they consummate their feelings for one another, sharing a deep kiss. The Sentinels nearly lose their next game, on the road against Phoenix, but win on a couple improbable plays.
When the Sentinels return back to DC, O'Neil tells McGinty that Eddie Martel has crossed the picket line, and points out that the entire team of the league's defending champions, Dallas, have crossed as well. O'Neil shows no confidence in Falco being able to beat Dallas, and hints to McGinity that he could be fired if McGinty refuses to start Martel. McGinty gives in and reluctantly tells Falco, who then tells his teammates the same thing, demoralizing the team. Unable to face Annabelle after what happened, Falco leaves her stood up for their planned date.
In the first half of the final crucial game, the Sentinels fall behind to Dallas 17-0, and Martel refuses to get along with the rest of the replacement players, and also smugly ignores any play calls McGinty makes. The hometown fans, who initially despised the replacements, now boo Martel, having accepted Falco as their favorite. On the way to the locker room for halftime, McGinty tells a reporter that the team needs "heart" to come back and win, something he said Falco had. Falco, watching this on television, returns to the stadium, and McGinty promptly decides to bench Martel for Falco. Martel angrily tells Falco that Falco will never be known as anything but a replacement player. Falco says he can live with that, and takes over while Martel gets thrown out of the stadium. On his way back to the field, Falco finds Annabelle and apologizes to her, giving her another deep kiss in front of the crowd and other cheerleaders.
McGinty tells the replacements that the strike will officially end the next day, giving the players incentive to give everything they have left. The Sentinels rally back to a 17-14 score, with Gruff being called to kick the game-tying field goal late in the game. However, Gruff spots bookies that he owes money to in the crowd, and realizes that they want him to throw the game. He hints this to Falco just before the kick, and Falco pulls the ball away, causing Gruff to fall from the momentum of his kicking motion and break his arm. Falco initially scores the apparent winning touchdown, but it's called back on a Sentinels penalty. With Gruff unable to continue, Falco tells McGinty that he "wants the ball", affirming what McGinty had told him before. Falco calls for a deep pass to the replacements' deaf tight end, Brian Murphy, and hits him with the game-winning touchdown pass as time expires, earning the Sentinels a playoff berth. Falco embraces and celebrates with Annabelle, while McGinty narrates that the replacement players left the field with nothing but the satisfaction and personal glory of what they've accomplished, which is living the athlete's dream of a "second chance." He then watches the replacements dance on the field to the Gloria Gaynor song "I Will Survive".

Question: Who is the head cheerleader?
Answer: Annabelle Ferrell.