Not an owner but my bro (who's also my next door neighbour) has had several litters of wabbits in the last year or two.
My understanding is rabbits pull hair when they can't find another source for making a nest.
Solution: a trip to your local Spotlight/fabric shop (or pull an old cushion apart) and get some pollyfill also known as hobbyfill or wadding.
She'll take the stuffing into a quiet, secure sheltered corner and you'll find her little litter on hairless bunnies underneath it (inside the pollyfill) in about a month from memory.
They are pretty self sufficient mothers but on occassion you may need to intervene by bringing them inside and sringe feeding every couple of hours. There's heaps of great online sources of info about breeding wabbits or go and hassle your local pet shop or the previous owner for info if you don't like reading.
Especially if this is her first litter. Good luck with it.