Well at least you both survived to see another day. And your sense of (i'm not sure the correct word to use here) regret, concern, and responsibility for what happened makes me feel like you aren't a mindless squid. It makes me curious to know the conditions of the accident and whether it was your fault, but I don't want to pry.
The important thing is that your sister and you, and anybody else involved, is alright. Next most important issue - how's the bike after a high side? But I guess my question here is, whether or not it was your fault, did you learn anything from this/are you and your sister scared away from riding now?
I'm sorry to hear bout this, but on the bright side here, at least you're both alright, and assuming insurance covers this - you'll be looking at a new ride in no time!
Fz8? next time around?