S.S.
It is just a phase...my 2-year-old is just starting to be daddy's boy. I "complained" about it to my husband, and he pointed out that for pretty much the first 18 months of my son's life, Daddy was just this guy living there, and wouldn't give him the time of day. :)
So, I know it's frustrating (at one point, both my kids preferred me, which really frustrated me!)...but, when it changes and she prefers her daddy, it's hard too. :)
Good luck!