I don't think Renesmee would be angry or disappointed if a member of her family was got hurt or dead. She's half human, but part of her is also vampire and she's being raised by them. She probably knows that is difficult to resist the thirst and a 24/7 battle to resist human blood. this kind of event may be tragical and she may be a bit shocked, but I think she'd stand by her family's side and try to be supportive. She knows how they think abot humans and how they respect and love them... but she also knows that if something like that happened it was a tragic accident. She's a Cullen, after all. She's not among murders.
I think we need a new Renesmee thread.