It's even more likely that her mother had a condo that was paid for before she went into the assisted living facility. Granted, she could have sold it when she moved, but I can see Dee Dee talking her mom into keeping it and letting her live there. Why? There's an old saying that you are known by the company you keep. Considering that Dee Dee is a co-star in Chantal's Shit Show, playing the part of someone who is allegedly fucking Nadir, of all people, and letting him live with her I think she has a lot--a whole lot in common with Chantal. So, Dee Dee isn't the kind of person who strikes me as someone who would have been responsible enough, or perhaps had the necessary credit, to swing a mortgage. In other limericky words:
Nadir had a trap in Gatneau
Which is where Chantal got hooked on blow
But she started to cling
Even bought her own ring
So he moved to Dee Dee's mom's condo