I have taken methylprednisolone which has helped strength while in my system … though I think you’ll see from posts on this forum that they don’t work for everyone. These weren’t offered by my neuro but I asked to try them…seen some research that they might help progressive…and glad I did.
How is your wife’s health generally at the moment? Is there any chance she has an infection - urinary tract infections are particularly common and any infection can very quickly knock us down and cause many symptoms including weakness. I’m not suggesting that this is definitely the case but the sudden decline could have another cause. Often we write all our symptoms down to ms progression and this can be detrimental.
I have now started my second course of steroids and they’re working well. I appreciate everyone will react differently but note you mention your wife’s thermometer …I find the hot/cold switch is triggered more so. Personally although really cold I layer up on lightweight fleece blankets and can over a night go from 3, 2, 1 and 0 and back again in the space of a few hours but overall too much heat makes my symptoms much worse.
Hope your wife gets a much needed boost from the steroids …