My daughter is 8 now and she's been always that way, she is still is, she is only asking for something when a friend does it and usually because we ask her so many times what is it that she would like to do that she finally chooses something (whatever she doesn't dislike too much) Now for the first time she chooses to do Karate and commited to a year of the acctivity (I am hoping that she will because we have to pay anyway!!! She has been going for more than 2 month and still likes it (twice a week). Sometimes it is not about what you think they may like, she is very girly and never thought she would like Karate, buy I made a comment once that it would be nice to know some karate or tae kwon Do as self defense and that stayed in her mind...
She likes to swim but would never compete, she is starting competitve swiming this summer just because that is where she is supposed to be for her age, but I know that she will end up being the last one and won't care because she is not competitive and swims just because she like swimming.
She did dance, ballet, tap, jazz, gimanastics, soccer, tennis, skiing, ice skating, and my husband tried teaching her windsurfing or sailing....nothing worked! She does goes occasionally skiing with daddy, and tennis with him, but doesn't really want to.
Now she is taking piano (she wanted it?) but not practicing the way she should and not being very excited about learning either.
She loves reading, she is inside a book almost every day (new thing since last year) but non stop.
So my suggestion would be, suggest different things that she might want to try, tell her that unless she tries she won't know if she likes it and let her try and quit until she is interested, sometimes they ask to go back to somethign that they tried before....That happened with dancing, we will start again next season.
besto of luck!!!!!