S.K.
I just had to answer at least to say that my son (age 3) does that same thing with hair! I never heard of another kid doing this before! He started it with one of those taggies blankets when he was a baby. Then my in-laws found this random garfield stuffed animal in their house somewhere that happened to have whiskers and he transitioned to using that. After a year or more the whiskers were actually wearing off and I wasn't sure what I was going to do. Then when he became a big brother we gave him a baby boy of his own (which he promptly named "Isabella" go figure) and now he uses this doll's hair to sooth himself to sleep! He also kind of hums to himself as he does it. He really depends on this, if he doesn't have something to do this with he has a really hard time sleeping! So I wonder if you should try again to find something that she can use instead of your hair. That could potentially solve the whole problem seems to me based on how my son is. Good luck! You need some sleep mamma!