H.J.
Oh no! she is living there and needs to pay rent to decrease the others rent. Not just you...That is way unfair. I wouldn't say she needs to pay the full amount for that roommate because she does still have her things in there, but a good portion. She should also be paying a share of the utilities. You are actually most likely in breach of lease agreement by having her live there, anything I believe more then a week is considered long term. You are not the only one sharing the apartment therefore you cannot be the only one that can take advantage of the money owed for her share.