I think i know what happened, because my account was stolen some days ago. Your friend opened a link and signed up using his password. If you track the replies he got, one of them must be a phishing link.He must contact steemit and his account will be recovered in some hours.
He must report the user who sent him the link. If he doesnt know, I can check it out for him.
I hope that everything works out soon as possible :)
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Not sure - I checked my friend's profile and did not discover anything suspicious - she started to account recovery already and I reported this to steemtiabuse. Thanks for offering help.
Hopefully she can recover her account soon. Have a nice Weekend :)