What's wrong with my sisters email ?

My sisters Yahoo account isn't letting her log in. It says " we notice some unusual activity " then it says to verify this number but she used our grandma's phone she might not get to use it again till June. She couldn't use hers to make a new account because it said her numb has been used with too many accounts. Her boyfriends Facebook is with this email because it wouldn't let him use his Gmail to sign up. What's going on ? How can she fix this ? 

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