Why are certain employees untouchable and never seem to get fired no matter what they do?

i know a certain employee here , she is actually the manager of the business. yet she seems to be strangely under qualified to run the business and only has an advertising diploma from a college no actual business experience or degree.

and the business that she manages is way less busy than when she started so its not like business is booming under here watch. i was there last weekend a normally busy if not very busy weekend and was almost no one in the business other than a few random tourists

yet she seems to be untouchable and owner will not tell her its time to move on and hire someone else. does no one else want the job? does he know of no one else who could do her job?

i personally don't see how he could do any worse with anyone else as business seems to be going nowhere under her watch

and despite having a background in advertising she isn't even posting anything useful to the social media pages of the business , i checked them and there pitiful and really bad actually.

Updates
7 mo
LIVE Less busy than usual ( only shows a tiny red line so place like empty ) , according to google not even anyone there at 7pm on a Friday night , like seriously this place needs help , can't believe the manager is not looking for somewhere else to work ( i mean another place to ruin ) at least for the winter months as this one seems toast and not even a post on social media about MLB playoff game and no specials for it either
Updates
2 mo
she's still there apparently for another summer season , i didn't go in last night ( Friday ) but checked google maps and said place not even busy , on weekdays when i drive by place looks deserted and barely anyone there at all. they tried to do some specials on certain nights for the winter but not sure how that worked out or not. advertising as being open for st patricks day but its on a Tuesday this year so not sure how that will go over
Why are certain employees untouchable and never seem to get fired no matter what they do?
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