Talked to my wife. She tried to install a voice changer software yesterday from a link on twitter and it didn't install. This is a windows 11 PC. I see something new called WingFtpServer as a startup program. That has to be it. C'est la vie 
Scan your computer and try to find anything suspicious. If you see something new, try to confirm if it has something to do with losing your Bitcoin. It may be the app that was installed, or there are other links that were opened by your wife without knowing that it's a suspicious link. See your browsing history for more clues/evidence.