Oh, for sure she is. She logged on to her Yahoo account and did her best. But she lived on her Hotmail account, so her Yahoo account doesn't even have all the email addresses that her Hotmail one does.
I talked to her tonight to get more information to continue processing it with Windows Live support for her, and found out that she'd been phished. A mail from MSN.com arrived, telling that her account was going to be deleted if she wasn't using it, but if she wanted to keep it
just follow this link and log in... 
I don't think she'd left her password information in her account; I was just realizing about my own habits, that I've got a couple of registration mails in some of my webmail accounts, and that if any of them were compromised, those mails would also allow them to compromise those other web presences.
So anyway they're reviewing the case with additional information now. Hopefully they'll reset it and send it to her Yahoo account.