You can try it. But Epsom salt also causes dehydration. So keeping freshwater
out is important.
You can do Epsom salt compresses a couple times a day.
Just know the Epsom salt isn't going to cure bumble you will have to get the infection out of there for it to heal.
Hope your wife heals up...
Only problems with them having access to epsom salt in their pool is its also a laxative , and for there to be any benefit to helping their bumbles you'd have to use quite a bit in a pool. I'd just soak individually.
:welcome