I agree with Gelda, let her rear her cubs in your shed, you'll get lots of pleasure from watching them, and then take back use of it and, recover the roof when they've gone their separate ways. If you just can't cope with this option ( I really hope you can!) then you need to contact Wildlife Rescue and ask them to take the vixen and cubs away, but I hope you can wait a while and let them enjoy your shed and garden! I'd also love to have them living in my shed/garden..........................welsh