Removing less of the colon leaves too much blood circulation burden on
the remaining blood supply, leading to blood-starved sections dying off.
Her hemicolectomy also promotes negative cancer margins.

Titanium staples, ideally.

Been there, done that. Once she experimentally learns to adjust her
fiber and fluids intake, she'll pretty much forget she had the surgery.
Our colon's primary function is removing excess water from waste after
our small intestine removed all the nutrients we need, so we don't even
need to change our diet or supplementation other than to walk the broad
line between constipation and loose stool. She will want to stock up on
the softest toilet paper she can find, and moisten it with water when
necessary to avoid irritation during periods of the latter.

My only lingering "symptom" is once in a great while -- a few times a
year -- my entire remaining three feet of colon fills up all at once, at
which time I have to empty it *NOW*.

I.P.