you need to ask her to pay the rent, and the say her pay with money, also use the hotfix if you have the bug that makes you get kicked out after paying the rent
that's the thing , i already did but when is says " do you have part of her rent?" it just ends the conversation even when her money exceed 400$ \
Edit:
NVM i found a way to bypass that ( lend money --> day comes pay lucy --> ask to pay rent --> get money --> pay back debt to rei)