M.,
I dont think you have anything to worry about. Developmentally, children go through "mommy" phases, just as they do "daddy" phases. I know it can feel heartbreaking, but i say, ENJOY it while it lasts, because there will come a time when no one but YOU will do and in those moments, you'll long for a much needed break! :) the good news is that neither phase will last long.
I also understand daddy cant do it all the time either, so assure your child (calmly but firmly) that you understand her need for daddy and that he is there for her when he can be, but sometimes you need to be the one to help with clothes, diaper, etc. You may even have to do so through tears and fuss...so long as you communicate with her and do your best to keep your cool and not react (saying things like, I know it makes you sad, but his is how we need to do it today, etc.), i think you'll all be fine!
Remember: YOU ARE THE ONE IN CHARGE, NOT YOUR DAUGHTER, AND SHE TESTS YOU TO BE SURE OF THIS...SHE WANTS/NEEDS YOU TO TAKE CARE OF HER, SEE HER AND LOVE HER, DESPITE HER NEED FOR DADDY OR WHATEVER ELSE MAY COME UP FOR HER IN THE COMING MONTHS.
and dont, by any means, take it personal! Good luck!
Jenn