did she play heal? tank? try play a class that have small responsibility like dps, especially for someone with age of 13 i doubt she can take the "finger blaming" feel when it come to stuff like that, especially if she is a sensitive person.

Nah If someone else is being a dick to someone in a trail/dungeon I'm in Im going to speak up
if it you maybe yes, but we are talking about 13 years old daughter here, and op already told us that IT IS partially her fault so.... blame? yes, but maybe the blaming is a bit excessive in this case. In mmo games that kind of attitude is consider normal though, either she face reality and face it like a real man (girl) or take a break from mmo and play singleplayer games first, its the only choice i can see.

look at the bright side, consider it a life experience, if she can get behind it she can develop a strong will and it will be useful in the future later when she start going to be working in real life.