This should regulate her to sleeping fewer times but for longer. Her daughter wakes up two to three times a night and then takes about an hour to get back to sleep. Mom is becoming an insomniac and in desperate need of some help with sleep. Then kids start having one nap around 15 to 18 months. Your friend absolutely needs to get some more sleep.
Parents often forget how important is it for their children that they get plenty of sleep, too.
So, tell her to first work on getting her little one to fall asleep on her own at bedtime. See my book Sleeping Through the Night on lots of helpful hints on how to do that. This is very common between ages six and nine months. First of all, go back to what you did before that worked. Next, don't keep her up all day.