Well she's back in again. Doctor was convinced it was acute appendicitis, so packed her off to hospital.
Surgeon that examined her is adamant that it most certainly isn't. Now investigating kidneys, bowel, bladder etc.
On a brighter note, when the ex wife was filling out the associated and inevitable paperwork (why we have to do this every time, as we've nearly lived there for the past five weeks, is beyond me) in 'father's occupation' she wrote "trailer guy"
So I guess it's official now and certainly made the little one smile!