No, it`s not acceptable. Maybe she could keep pushing for a cancellation. Years ago I needed an ENT operation. The consultant surgeon told me (in the November) that the waiting list was one year but said "However, I can do the operation privately for £400 plus £100 per night in hospital for 5 nights". I told him I would not pay to go privately as I pay my National Insurance contributions and would get my money`s worth. My operation on the NHS came through 2 months later. I should have reported him for that as he was pulling a fast one.