Mroning sqad and 237..... I'd suggest you ring your GP, you may be "lucky" and have a saturday morning clinic, some do - if not, there will be a number for an out of hours service if you still have one. There are huge problems being reported with 111 - some GPs want their out of hours option back, but that's another story. You don't have to stay with your GP, you can always swap these days. A formal written complaint to your practice manager will mean that your mum's care (or lack of it) is investigated - there is a very clear process and timelines for complaints, these days. It sounds as if the GP should have instructed a district nurse or community matron to visit (which can be a good thing) but it hasn't happened - not good.
From personal experience when my mum had a fractured pelvis, she was confined to bed for about a week, but she was in her 80s and I don't remember too much of the detail. I've googled a bit and about 3 weeks' bed rest is advocated - stairs might not be a good idea, IMO, but it all depends on the nature of the fracture.