Has she tried to speak to a GP or via 111 and, if not, is she able, and willing to try and speak to 111 (or authorise family to speak to them), see if she can get an out of hours telephone appointment?
Is she able to check her temperature and heart rate, for any signs that she could have an infection which really needs to be seen to. With her foot, was there any kind of open wound and, if so, how it is? Are there any signs of infection there?
Does she have any conditions which would class her as extremely vulnerable? To help with any care needs, supplies, medication, washing products etc... If so, she can register here for help when the community hubs are set up:
https://www.gov.uk/coronavirus-extremely-vulnerable. However, it sounds like there may be a delay in getting official NHS volunteers set up as they have to go through a security clearance.
For more day to day needs, getting food, medication etc..., there may be a local group to here where people are offering their help, quite a few about on Facebook. Obviously need to check they are legitimate but could be worth asking if anyone there can help with anything.
Say if she can speak to a medical professional and if she is prescribed or advised to use any medication which needs to be picked up, rehydration sachets if needed, any products which might be able to help her cope like plastic sheeting for under bedsheets or incontinence products (nappy type pads/plastic over-knickers etc...) to help reduce to burden of so much soiled bedding and clothing? Extra washing products for clothes/bedding and personal hygiene, cheap packs of extra pants, extra nighties etc... Things to help her get by at home if needed.
Even things like puppy pads are cheap and easy to get hold of by someone shopping for her, easy to pop under her on a chair or in bed.