My DD is 2.5 years old. She also does not do well with change, and she has seen a lot of it at her daycare in the past year, along with our moving in with my parents. It was "easier" when I moved in with my folks because she was little and wasn't verbal yet. She ramped up her nursing like crazy and clung to me a lot. I made sure to give her lots of reassurance and physical contact.
Though your DD is 3 and more verbal, I think the same rules apply. She is feeling the effect of this change and is fighting against it, because it makes her feel insecure. Reassure her a lot, remind her of your love for her, give her lots of closeness, and perhaps try to find some activities in your current house that couldn't be done in the old one. Perhaps start a crafts activity hour a bit before bed, or start making special trips to the library for story hour...or to a local pool...or...maybe make Friday nights "brownie making night". It will take time, but she will adapt.
Verbana is right...one week is a very short period of time.