Fortunately, due to dementia, wifey and I have managed the financial end of things for a half dozen years, so it'd be tough for a scammer to penetrate our zone.
I can sure see situations where an out-of-town relative trying to figure out a relative's affairs could get nailed.
If you get a credit card bill and cannot substantiate the charge, ask for an itemized bill for the estate. Your estate attorney should be able to help weed out fraudulent charges also.
So very sorry for the loss of your mom. Prayers...