"Its entirely possible she has a young relative who has conducted serious criminal activity from there and its ewntirely possible it was a terrible screw up."
Sure, anything is possible -- for example, to see pigs flying is possible.
There's no indication of what you suggest in the story or the local news. In fact, a 75-year old neighbor of this lady had been raped and this lady was apparently terrified it would happen to her. That's why her house was like a fortress.
I am attempting to not judge beyond the facts available - I said it is possible that someone other than old lady did something to merit a search of the house and I don't see how, given current info that one can argue that is not a possibility.
And the police were all plainclothes, which means not identifiable.
I don't know why you send undercover plainclothes people to SERVE A WARRANT. I would send a fully decked out police officer for that so there was no confusion.
I did wonder if they all got shot because none of them could believe a 92-year-old woman was shooting them.