My mom tried eating today..?

My mom has
recently gone 3 weeks without eating, and today she tried eating for the first
time in 3+ weeks.
She had one or two KFC hot wings and some fries and potato salad.
Her stomach got upset and she vomited not very long after.

How can we prevent this?

Every time she eats will she vomit?

She is depressed which isn't much help at all. Is there a certain thing(s) we
can do to help?

Thanks.
After not eating for three weeks, KFC is probably not the best thing to start
back on. Her stomach is not used to food right now and filling it with greasy
fast food will only upset it.
Now I'm not a nutritionist, and it would probably be best for you guys to go see
a nutritionist or doctor for advice. But I would recommend starting out with
something light to get her body back to normal, like some soup broth or crackers
or Jell-O.

But please, even if you cannot get an appointment to see a doctor, at least make
a phone call and talk to a nutritionist or physician to see what's going on
here!
why isn't she eating??? If she want to lose weight she is doing it the wrong
way!! By not eating, espeacially for so long, the food she does eat will be
stored in her body as fat!!! It may seem weird, but your body acually need fat
to survive! by not eating for so long then eating, she's acually gaining
weight!!!! Plus, she's killing herself!!!! You can die by not eating for so
long!! It's called malnutrition!! Why do you think so many people in africa are
dieing?? They aren't?can't eat!!! I think your mom need to talk to a doctor
right away!!! Please listen to me. It's for her own safety!
What were you all thinking? That's the worst thing someone can have after not
eating for so long.

Try some pure, light foods. Whole grains, fruits, veggies, applesauce, yogurt
and the like. None of that fast food crap.
Not eating is the worst thing to do to lose weight. Not to be rude or anything
but your mom might be Anorexic. Or headed down that road at least.
Just eat couple of small meals a day and don't eat too much at one sitting.
GO TO THE EMERGENCY ROOM NOW!!!