Thank you again, everyone! I appreciate your support more than you know.
Deb, you're right - my dad is a real trooper. Although my instinct is to rush in and take over, he is really on top of things and he knows her best so I am going to let him take the lead and give him information as I gather it (I've been talking to a doctor friend) but be respectful and substitute my judgment for his. Don't know how long my mom will be there -- I'm thinking at least a couple of weeks. She's still really groggy from the meds so I think it will take some time for her to get acclimated to them/get the dose right, and get her back to walking with her walker.
I had planned to take my son to visit today but it's 50-plus miles from his base and the traffic was just awful and we'd have been in the car for hours, so he and I just hung out near the base and went to lunch and movie. My dad called later and said my mom was asleep most of the day and wouldn't have known we were there, so I think it was the right call. I'll go down tomorrow by myself and see them.