We are very much in hospital then; they are testing her for a number of things including pneumonia. They've told me not to worry, but she is feeling pretty grotty and every time the paracetamol wears off, her temperature shoots up. She has what is called febrile neutropenia, which is why she has to stay in. They have yet to get to the bottom of what is causing it.
They are currently loading her with antibiotics and taking loads of blood samples. I'm still waiting to get a date for an MRI of her organs in relation to other new condition she might have, so I might try and wangle that whilst we are here as it's more likely to get squeezed in if she is an in-patient.
On the plus side, after 3 bags of blood she is looking much pinker, and she's having another one tomorrow so she'll be practically glowing by then!