Uterine cancer... what's involved?

I found out that my grandmother… the closest person to me in my life… has uterine cancer.

They haven’t told her much; they don’t want to tell her anything until she has a scan to see if it has spread elsewhere.

All we know is that she’s definitely going to have a hysterectomy, and that the doctor said there was a “lot of good tissue” in the uterus.

Things they haven’t told her though, that I’m interested in knowing:

-does a lot of good tissue in the uterus possibly indicate that it was caught at an earlier stage? Would it generally permeate the uterus before spreading elsewhere?
-If it is contained in the uterus, will a hysterectomy be all that’s needed, or will she still need some form of chemo?
-She’s probably what’s considered morbidly obese… what issues could we potentially be facing because of her weight?

I wouldn’t even know where to start Googling, and if you want the blunt truth, I’m not handling this very well and Googling medical issues almost always makes things worse if you’re not 100% optimistic. Google is the maker of modern-day hypochondriacs.