Pediotontists OFTEN ask the mother/caregiver NOT to accompany the child into the treatment room. That is standard procedure here, supposedly because the child is better behaved when momma is not in the room. (Read that as the child is too scared to kick up a ruckus while surrounded by strangers without any loved ones available for support.)
It is also standard procedure for a small child who is undergoing a dental procedure to be given an oral antesthetic as well as injected/inhaled antesthetics.
Both of these things have been done to my boys when they were little, they could not have been treated by the pediodontist if I had not agreeded. I remember signing that form that said I understood what reactions could happen, and promising not to sue. The form said things like "loss of limb, loss of life, coma" Bad, bad stuff that the pediodontist will tell you is VERY RARE. I would imagine that everyonce in a while, a bad reaction occurs.
Poor little girl.
By the way, to the poster who thinks this type of treatment could have been avoided with preventative care.....NOT. My boys have all seen a dentist before they had teeth. They all brushed/flossed daily---in fact, I did it for them before they could do it themselves. They all took oral supplements of flouride. Still, chit happens. Try not to blame the mom because it just might not be her fault, have mercy.