Am I giving off mixed signals?

I have a few female friends. One of them I like and I will often buy her little things because I feel they will make her smile or Ill cook her food etc. But I will sometimes do this for my other female friends, especially if they're having a really bad day. Am I ruining my chances with the girl I like, or sending mixed signals? Would she think I like the other girls too?
Am I giving off mixed signals?
Post Opinion