We're new to this turtlekeeping stuff, so we don't have much more data on Pixel or Red-Eared Sliders right now. This has led some to speculate that she is actually a pig who has borrowed a turtle's shell in order to look cuter and thereby get fed more often. Again, any expert who can help us certify her gender, please write.
Turtles are, by and large, omnivores.
Pixel will eat just about anything that smells like food. Tubliflex worms are her favorite, so we feed her those sometimes, just to watch her chomp them down with glee. Mostly she eats whatever amount of feeder fish she can catch on her own and we make sure she eats by catching one or two and dangling them on the water for her to grab. She also eats a lot of plants, anything we bring home that's a plant, she eats. Shredded romaine lettuce is good too.