Unfortunately, you're unlikely to know there is a problem until a problem has occurred. Hopefully, it will be a small matter of an unpaid bill or two instead of, "I've gotten into a morgage I can't repay."
I’ve already had it happen. My DM refinanced and refinanced until she couldn’t afford the home that she inherited from my DGM. It was said to see it go 3 years ago but I couldn’t afford to buy it and if we had now it wouldn’t be worth what she needed for it. :( My DM is only 68 now just horribly irresponsible with money.