Hi, sorry to hear that your daughter is being asked to repeat her PGCE placement. This usually happens when the school a student has been placed in has submitted an unsatisfactory report on the student.
A student repeating a placement can be asked to do so at any period throughout the school year. Schools that take placement students will be arranging first-time placements for this year's PGCE students, so your daughter may have to wait until a space is available for her repeat placement, and this could be at any time during the school year. Unfortunately, she cannot graduate with her PGCE until she has completed her placement, so she is caught between a rock and a hard place here.
She might try talking to the Advisor of Studies or Course Director of her PGCE course, to see if she/he could offer any help with the timing of the placement. She should also talk to the accommodation officer in the university, who will be able to help her find somewhere to stay for the seven weeks.
Hope things work out ok.