Wow. Sorry to hear that. If your good friend is a she then she should get in touch with "Jennsaurus" at Wikipediasucks.co ASAP because Jennsaurus is a journalist who has discovered and compiled two dozen cases of sexual harassment against women editors.
There are two dozen sexual harassment scandals committed by admins and editors which was uncovered by a journalist starting from a year ago. She has finished written the feature story which might get published on the Daily Beast next year.
Sometimes "sockpuppet abusers" aren't just banned. They get doxxed on LTA (Long Term Abuse) pages and so on with their IP addresses, locations, habits, names, and even off-wiki activities. Talk about a GDPR violation.