At one point XH had told me she entered payments and paid bills. I know he wanted to pull back on the bsness side of things as much as possible
Worrisome. A fairly easy scam to pull on a doctor or dentist who doesn't want to be "bothered" with the business side of things is to make payments to a non-existent company that - guess what - is actually a bank account belonging to the employee. A busy practice that pays lots of bills to different vendors might not notice one additional "vendor" being paid. And a gradual increase in overhead costs might be attributed to inflation.
Do Bubbles and her husband seem to live a lifestyle that is better than one might expect from their supposed income? Agreed, it's not your problem anymore, but if it looks suspicious, you might mention it to your girls as a possibility.