I like being friends with the girl but I don't think I want to date her
Why would you not want to date her?
That girl is too high maintenance for me.
It is your right to not date someone if you don't want to. You should probably tell her how you feel so you can have mutual understanding.
I don't want to hurt her feelings or ruin our friendship.  I want to avoid that if possible.
As long as both of you have the same understanding this is okay, but you may need to tell her if she has a different idea.