while Bonnie attended college (nuclear science) Domah was working at a small cafe that was close by Bonnie's home.

around the time Bonnie graduated, the two were already really good friends.
but then Domah broke her arm and had hit rock bottom.
Bonnie stepped in and let her stay with her until she got better.
after Domah recovered, Bonnie let her stay because being roomies seemed like a better option for their wallets.

and they already worked out a system in the few months Domah stayed.

vvv