It’s perfectly fine to keep your distance while you are figuring out how to proceed and how to sort your feelings and what’s the best.

It’s entirely possible she is depressed. That’s why I’d totally get it if she wanted to do nothing for the holidays. Even not being depressed justifies wanting to do nothing during pandemics. But depression doesn’t justify blatantly wanting to spend time with one friend over another and being kind of back handed and rude about it

Of course we can make it all about her: poor victim of being caught up in between and she is so depressed and doesn’t know how to speak up. But that’s how some people get away with things. Too depressed, doesn’t know better, had bad childhood, her brother is mean to her not coming for holidays etc etc When does it end? She is a grown up. I’d expect better behavior from 60 year old.

Personally I’d let my feelings subside a bit and keep my distance and then reassess if I need a friend who I get hurt by and have to walk on egg shells around