I’ve had PIs threatening me as PostDoc to void my contract and have me deported for wanting to take some vacation accrued over several years, or (different gig) for wanting to go to a job interview. And that was me as a married 30ish white male. Can’t imagine what it can be like for the 22 year young woman away from home for the first time.
It's typically very easy to find former PhD students and postdocs that have worked with a given PI. Sometimes they are even listed in the PI's website, but if they aren't, they can be found by looking for the PI's papers and checking the coauthors, or in the case of PhD students by looking for PhD theses.
Find their email address and politely contact them, asking about their experience with that PI. Most people should be happy to respond, and that kind of information is invaluable.