A study was performed on 166 pediatric patients mixed post-arrest and closed head trauma. All 166 had fixed and dilated pupils.
Of the 166, only 13 were discharged from the hospital and a mere 8 of them had "productive" neurological function.(Sorry I cannot post my source I pulled those facts from a presentation I have).
Anyway the point is, no one here can tell you if you did any further damage than the mother did, but I can tell you this patient had a VERY slim, almost nill chance.
What you need to decide is if you did what is RIGHT. If you walked into a house with an unCx patient that is not breathing, and no obvious trauma you did what anyone else would do...Opened the patients airway.
I just finished a code where the wife stated "he just collapsed", we found him lying supine on the carpeted floor, first thing i did was a head tilt chin lift.
So if the story I am given afterwards by police is that the wife hit him with a frying pan and pushed him down the stairs, only to drag him back up and call us, did I do the wrong thing?
Of course not. So if I switch my adult patient for a child does that change your answer?
Perhaps you need some professional help to teach you how to deal with these feelings. We all could use some help sometimes.