I'd first begin by expressing my sincere sympathies for the pain and suffering you and your mother are going through. God knows life is difficult enough without having to endure the pain of seeing ones body age faster than it already is.
On the topic of MINOXIDIL, I'm afraid I can't offer much as I've never used it personally. Though I can however offer some information on the effects of long term exposure(use) with Miracle-Mineral-Supplement all on it's own.
MMS: Over the course of four(4) years, I took Miracle-Mineral-Supplement in large doses several times per day, every day, in various forms. To which I'd add, I did not experience any aging effect on my skin or face.
Having said that, this does nothing to address the potential for chemical interactions between such things as Miracle-Mineral-Supplement and MINOXIDIL. And so there are always these possibilities to consider as well.
In short, since MMS is not a recognized chemical in the world of human treatments, we have very little to go on in terms of pharmaceutical interactions. Which leaves us at the mercy of our own personal trials and potential side-effects. As you yourself and your Mom may have experienced.
I'm sorry if this isn't the news you were looking for, but I figured it would be best to tell it like it is, rather than to risk exasperating things further.