Her Wiki page
https://en.wikipedia.org/wiki/Serena_Au%C3%B1%C3%B3n-Chancellor
The Russian Accusation. Who do you believe?
In 2021, Russian state-owned news service TASS published accusations from an anonymous source claiming that it was Auñón-Chancellor who was suffering from the deep vein thrombosis that she published her paper about in 2020 and that it provoked an acute psychological crisis (emotional breakdown) in space during Expedition 56 and in late August 2018, in an effort to return to Earth, sabotaged the Soyuz MS-09 spacecraft by drilling a hole into its orbital module.
The accusation was denied by NASA and officials say they knew the precise locations of the US astronauts before the leak occurred and at the moment it began. None were near the Russian segment where the Soyuz vehicle was docked. NASA said they shared this data with Russians.
The accusations in 2021 came during a period of increased geopolitical tensions between the US and Russia. It also came weeks after a particularly embarrassing moment for Roscosmos; during the docking of the Nauka module its engines kept firing causing the entire space station to flip over one and a half times