Hi guys, I read this forum a lot, and finally became a member instead of spying

I have a 1 year old and I finally started putting Emmy's hair in a top knot. I put it in in the morning, and take it out at night (learned from this forum!) consistantly for about 3 days. The thing is she keeps scratching at it, I make sure it isn't too tight...if I just keep doing it will she get used to it, or have I waited too late and she's too old?
I can't watch her all day to tell her not to scratch...I WISH I could bring her to work...but I wouldn't get any work done...