If it comes to it, at 11 weeks they will do fine. Do you cake them? If so, they will be fine once they get over missing their mammy. I'd leave them with the group they are used to. However if you don't cake them you may think they could use a bit of cake to make up for the milk they won't be getting.
I'd be asking the vet if there are any known fever-type infections about, and how to treat. She may need something to bring her temperature down, she may need anti-inflammatories, etc. How is her breathing, could she have a lung infection?