My daughter will be two next month and we are also going through this big time. She will only let me do anything for her. She will still kiss and love on daddy, but if mommy leaves the room there is a blood curdling screaming match going on. We are hoping this all just works itself out, right now we are trying not to give in to her constantly. I mean I love snuggling and cuddling her, but she is almost two, I'm 8 months pregnant, and I can't hold her all day long. I think for my daughter at least it also has something to do with the holidays. She didn't really understand why daddy was suddenly home with us all the time (for two weeks!) Last Thursday, she didn't want daddy to touch her, only mommy to hold her, but if daddy left the room she would freak out.
I'm sure it's just a phase, hopefully both girls outgrow it very soon! :)