Look, windows phone aren't for everyone, the best thing you can do is find out why she doesn't want a windows phone, listen to her closely, and attentively, don't argue or push her, calmly address each one of her concerns in an earnest and thoughtful manner.
If she still doesn't want a windows phone, then and only then punch her in the mouth. Jk lol, remember to each their own and never forget that not everyone can handle greatness LOL