Welcome to NeuroTalk,

I am sorry to hear of your mother's struggles.

All of her symptoms sound classic PCS. The delayed symptoms are common, too. I think it goes something like this. The brain gets challenged by the noise or lights. It struggles to tolerate them. After some other stresses or just plain tiredness, if finally become symptomatic. This would be even more likely later in the day when her end of day fatigue finally hits.

I can have a bad day the day after an event even though the event went well and the period after the event went well.

Hope this helps you understand.

Check out the TBI Survival Guide at www.tbiguide.com

It is full of good information.

My best to you.