Thanks for the support, all.
Surgery now likely for Thursday, been issues with a potential heparin allergy, and a possible underlying infection. By Thursday, it still have been 10 days bedridden with wires and tubes. Kind of awful.
There are complicated feelings around all of this, estrangement with her only ever a few months ago, and things were definitely awkward/strained. When I was driving the six hours on Friday the get there, I spent the first half of it thinking not about my own loss (there wasn't much there to lose, honestly), but about Ivy not being able to spend at least a little more time with her, and about what could have been (if my mother hadn't made so many selfish choices). I'm not forcing myself to make sense of any of it or make myself feel the way I "should", I'm just experiencing all of it.