Dwarf refuses to stay in hospital until she has recuperated
Solution 1:
Some time (gaming time) has gone, and it looks like they are healing just fine. The lower body is no longer "cut open" but merly "dented", and the body part is now listed in yellow and not red any more.
I guess we should not worry about body parts listed in red as long as the treatment page does not require any treatment.
She even had a "satisfying sparring session lately". Truly a "short, sturdy creature" :-)