Hey! Great, you made an app! I like it so far, there just need to be a few tweaks made.
+ The first thing I noticed was the lack of playby. Emma Watson has already been claimed and seeing as that is, essentially, who your playby is, you can't have her. I'm sorry. Rose Weasley has been played a lot across many boards so it there are a fair few playbys about. I have a few suggestions for you -- Anna Lutoskin, Alison Sudol, Erica Altosaar and Katerina Martinovska to name a few...
+ You need to find Rosie another wand because that one is a bit on the strange side - a little too short too. Something like Holly, 13 inches, Dragon Heart-string would appeal to her I think.
+ You really need to balance out the strengths/weaknesses and likes/dislikes. Remember that weaknesses are what make the character, not the strengths as they do not prove to be a character's folly. Perhaps she has her father's temper or something? Think about the magical world, think about her life - what would she dislike about it?
+ History looks good though might I suggest changing the fact that she found herself alone with her brother? Hermione would not leave her children at home alone, I assure you of that. You could say she spent a lot of time at her grandmother's with her other cousins - or something to that effect.
Apart from those few things it looks good!