Sounds like she's in the hands of very caring people! She's a very lucky girl!
There's nothing more important to me than my 4 girls, my wife, mother and daughter German Shepards, and a Chihoua? (She was my wife's, came with the territory, but is now family.)
BABY aspirin - a regular dose of aspirin is too much for them.
One baby aspirin i think every 4-6 hours max - even for big dogs - and no more than for a week.
It does damage too, just not near as fast.
As I remember, even on the internet it tells about aspirin and dogs. Do a search.
Dogs have a way of internally turning off pain and of healing themselves. Vets don't know everything - but they do know what can be harmful.
Make sure she has a good soft warm bed - preferably next to yours. I'm sure cold aggravates it. And good healthy food!