The tenants have a contract to stay there 12 months and only 3 months have passed. the 1 month notice bit will be after the initial 12 month period has passed. If your friend wants them to move, she'll have to pay them. They have a right to stay there for 12 months (when you say generic i assume you mean an assured shorthold tenancy).
Look at it this way - if they wanted to move out before the 12 months she could make them stick to the contract and pay her for the remaining time



