It could easily be the case where she sounds quite unpleasant in a short bio like that, but come across much better in a fully fleshed out story. You can really only tell so much with these little bio's - that's one reason why I don't really like them, because they can give wrong impressions. The only way anyone can really tell what the character is like is to read the finished product. Ultimately, the person you should be trying to please most is yourself, so if you're happy with it then you should go with it as is. But just keep in mind that a character with no redeeming features will appeal to no one, unless, perhaps, they're the villain. So if they're not a villain then you need to give the reader a reason to care about them. Good luck with it!