i have a 10 week old kitten.. omg she eats soooo much she is 1/3 the size of simba which is 4 months old, and she out eats him!!! i feed them the same amount and she eats faster and more than he does!! is that normal... shes tiny!
When a kitten seems to eat a lot more than they should, the first thing you suspect is worms. Has she been dewormed and deflead?
Also, if she came from a situation where food was scarce, she may be bolting down lots of food so she 'gets her share'. Best thing is to firstly get her treated for worms and then feed wet food morning and night and leave out dry food for them to eat during the day.