If you can convince a doctor to write for it, a warm pool, (exercise of any kind) but warm pools are great, as you can move through the water, (not necessarily swim), with some resistance, and get some "soft" movement, and blood circulating.
DEW her does this.

I think it's excellent, and is recomended by my doctors!
(You asked how to slow the spread, and this is the only thing that I think will do it, imho) Exercise.

Feel well!

Pete