Was your mother in law vaccinated? If so then how do we tell if that or the disease caused the damage. It could even be some kind of synergy between them, like ADE.

My in-laws are on the conspiracy theory spectrum and not vaccinated. Sorry to bust a hole in your theory.

The covid vaccinations in wide use now (e.g. the mRNA-based shots, adenovirus-vector shots, and the Novavax protein-based shots) either cause your own cells to create or directly insert modified versions of covid spike systems into a person's circulatory system. The biodistribution study conducted by Pfizer for the Japanese government (using LNPs with a non-mRNA payload) showed that the LNPs did not all remain at the injection site but rather spread far and wide throughout the body and accumulated in particular organs.

You have my sincere sympathy with regards to your mother-in-law's condition.

I have heard similar and worse anecdotes in which covid vaccines (especially boosters i.e. nth shots) have been the culprits and seen some severe adverse reactions in close acquaintances.

Anecdotally, everyone I've heard say "the vaccine caused ____" are the same people who say "The fish was thiiiiiiiiiis big" and regularly blame things on made up reasons instead of being willing to look at themselves. My brother says he's "never been sicker than after getting that damn shot" which is a HILARIOUSLY BOLD FACED LIE! He was literally bedridden for several weeks this year with various illnesses and nothing after the shot, but sure enough, because he wants to believe the shot kills you, he blames made up illness on the shot.

It's no different than parents blaming their child's autism on the vaccines they got, it's not exactly a rigorous examination of the evidence. It's wishful and directed thinking.

That seems reasonable. Would you also agree to discuss COVID vaccine complications when discussing COVID infection complications?