Your grand child is having a big red bump (egg size) associated with headache and vomiting
. last night she fainted and had fits
while taking a Ct Brain. You have not mentioned the duration of that swelling and you have told that she din't bump it. no spider bite
marks. As per the CT report no bleeding but increased pressure.
Considering the above history it goes in favor of injury
and ?infected which has resulted in increased intra cranial tension (cause for headache, vomiting and fits) but no intra cranial bleeding. Proper treatment by neuro surgeon/Physician to reduce intra cranial tension, associated with anti epileptic treatment and treatment of the local swelling by antibiotics and anti inflammatory drugs will cure your child. better to keep the child for some more days till the dr advises for discharge is a must. Otherwise nothing to worry.