iphone 4 cant access

hi my daughter bought an iphone 4 off gumtree yesterday with money she got for her 14th birthday! the girl she bought it off said she had wiped all her data off it and so we downloaded itunes and now it says she has to enter her apple id which is ?????? ive tried contacting and messaging the lady to get her to take the phone off her account but to no avail. Is there anything i can do??? I feel sorry for my daughter (what a shitty thing to happen) please if anyone can help i would appreciate it
sheree

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