Hi there Eyeshade.
My mother was suffering sickness and diarrhoea for 3 weeks, along with a chest infection. She was given antibiotics by her GP for the chest infection, although these subsequently killed off her 'good bacteria' and allowed the C Diff to take a greater hold. She is now very weak and been in hospital for 2 weeks. The above mentioned website I have found a great help with some good advice. I was also chatting with a nurse who told me about 2 types of antibiotic used to treat the bug. They are VANCOMYCIN and METRONIDAZOLE. I am not sure which is which, but apparently 1 of them is a 'cheap and nasty' version which can be effective but takes more time. The other is supposed to be the best, and pretty much guaranteed to provide a quick, effective remedy. The problem is, you guessed it.........cost. The NHS would prefer to give the cheaper version, which was the case with my mum, although as that did not work she is now taking the other type. It may be worth you checking with the medical staff what type, if any, your mother in law is taking. I wish you well and hope your mother in law makes a speedy recovery.
Best regards, Alb