What do you do when a coworker is losing it?

For the last week and a half , our keyholder has been acting and talking strange. One night she left me alone for 20 minutes and the asst. store manager called her, the keyholder got into a shouting match with her and threatened to off herself. She believes someone is intentionally loosening lug nuts on her car, she believes someone was video recording her, she claims she saw people running out with carts stealing merchandise,, and claims corporate has visited the store when they were on vacation. I can’t take it anymore, I’m tired of hearing about it. They gave her 3 days off but that didn’t fix anything. I wanna say “”FOR THE LOVE OF GOD, PLEASE STOP TALKING OUT OF YOUR ASS”!!! But I can’t do that because that would be in sensitive. I mean I have had burnout and panic attacks before, but this is not burnout, this is a whole different level. If they don’t do something soon, I’m quitting. Am I the asshole here? Its not I don’t care but I can’t take no more hearing the delusions

What do you do when a coworker is losing it?
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