Please do ask tomorrow -- it might be that she has "stuff" in her anal glands that is too thick to get out with at-home expressing. Vets are necessarily thick-skinned and are able to really express the glands completely which sometimes requires more pressure than we'd like to inflict on our pups ourselves. Other possibilities are worms or an itchy spot on her butt. How are you doing without Ms. Polly at home? Hang in there -- she'll be back soon!