Try giving her something else to do with her hands or even look at - a picture book for example. Or feed her so that she can watch out the window (or even watch telly) while she is feeding.
Have something soft with you (eg a toy or even some rolled up socks) and put her hand on that when you remove it from you. Hopefully it will feel interesting enough to buy you some time.
She's starting to learn as well, and experimenting with her world and her motor skills - which at the moment means being mean to you. It may be time for her to learn that if you pinch Mum then Mum goes away for a minute - but she won't like it at all.