I do wonder if Chloe has been in a psychiatric hospital. She's talked about being hospitalized after suicide attempts, and something a nurse mentioned is what made her suspect she had DID. (Thanks a lot random nurse.) But afaik, she's never talked about being hospitalized in a psych ward. Which would be odd. I don't know how things work in the UK, but suicide attempts (especially if you're telling people openly that's what it was) almost always result in mandatory hospitalization. Health insurance or no, you're going in for a week or two and they'll bill ya later.
You'd think it'd be something she'd make a video about if she had. Nan has made a couple of videos about her own experiences... Which are a trip to watch between a roommate snapping at her because they couldn't take another second being around one of her child alters and a doctor molesting Jeremy while checking for self-harm scars.
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ETA:
Looks like there's some indirect evidence to suggest the trauma that resulted in Nan becoming homeless and Ace being "kidnapped" was the result of
Sam getting involved with a couple of teenage alters who were pursuing him romantically.
Don't Nan and Chloe have relationships between their own underage alters?