<human>: Could you distill the essence of the text into 1-3 sentences?

My girlfriend's housemate has not paid her rent for the past few weeks, totalling $375. She (the offending housemate) has not been living at the house during this time and believes this is grounds to refuse payment, but the lease doesn't end until July. My girlfriend was too trusting (read: silly) and agreed to pay her housemate's rent for the period totalling $375, because her housemate had promised to pay it back as soon as she got paid by work. Unfortunately, offending housemate now claims that she was under the impression my girlfriend had agreed to pay all of her rent while she was absent (she didn't). Offending housemate doesn't have any intention of paying her debt to my girlfriend and is now staying at a friend's house in order to avoid us. She has messaged us informing us that she intends to remove her name from the lease and leave the house, but refuses to discuss the money, and refuses to talk over the phone or meet in person. Fortunately, all of her belongings remain at the house, so she'll have to return and confront us at some point if she wishes to leave. That is, unless she manages to grab them while we're out or staying at my house, but that's unlikely.

How can we get the money? If it's relevant, we have records of text conversations between my girlfriend and her housemate that mention the debt and prove my girlfriend did not promise to pay her housemate's rent. We have talked to the landlords and they can't help us. Also, my girlfriend owns the entire bond.
<bot>: Girlfriend paid housemate's rent, and housemate refuses to pay girlfriend back. How do we get the money?