Then try this approach:
YOU - "hey I was planning on moving my bed this weekend. It is quite heavy, think your boyfriend/fiance/husband could come help me"
SHE - "Oh, I don't have one"
YOU - "Oh in that case why don't you come over and we will keep the bed right where it is."
Of course, if she has a boyfriend and he comes over......... don't do anything regarding the bed.