I found this:
there are lots of different styles, since I don't know what your taste is :)
I went looking for some examples, so here they are :)
or what about peacocks?
I really liked this:
or a bit more simple:
I'd say you keep it simple with the colours and make one accent by painting flowers or so, then she could also more easily change it if she wants to :)
oh and, I'm 20 now, and I really like the things that I just posted here, so maybe that can help :) I hope so!
good luck with it anyway ;)
you could paint giant flowers on her wall, just a few, like tulips or so :) and maybe a more neutral color, I mean, a colour that is not bright pink, she might not like that anymore in 5 years :)