Best advice you could give her is to trust the process fully. If she is old enough to understand advice, then she is old enough to allow for each person to go through what it is they will go through. I imagine it is most difficult for the children (depends on age, I guess), but if she is old enough, then let her know that all she can do is listen to each one of them without taking sides. This will take great strength and courage on her part and she will have to allow herself room for error.. as we all make many of them... but we also learn from them.
I think G.d will help, but not in the way that is typically taught. G.d teaches through experiences. He already knows that her heart is broken for her family... the best thing to do is go with it. Unfortunately, most of learn most by devastating events... G.d is Life and Life is not stale..
Just like volcanoes bring devastation and there is little we can do to prevent it.. they also spring forth new Life. This is the same attitude we must meet those HARD blows in Life... go with it. Let the emotions loose and rather than trying to stop them in yourself and in the others involved, observe the emotions and it will be somewhere in there that Understanding takes root.
I do not say this from a position of not having experience. I was left in quite the harsh way... and the blows kept piling one on top of another in ways that would make most lose their mind... and I did for a bit lol... but I opted to go through it and to not cover it up with "prayer"... "false comforts" ... "false pleasures"... etc. I took them all head on and the result was more precious than I could even express.
As her friend, I would suggest offering up no advice. The ones who I am most appreciative to are not the ones who offered up comforts (for who can comfort something as devastating as a broken family?.. that is pious and haughty to think we could).. the ones who I ended up being most appreciative to are the ones who took the brunt of my anger and bitterness without ever walking away. (there were not many, mind you) They were the true friends, because they took it and never offered up the false comforts and never turned their back on me... thus allowing me to learn MANY valuable lessons that are deeply embedded in me. And they will forever be upheld in my eyes and valued more than treasures for their service and loyalty during my darkest hours.
Summery: 1. No false comforts.. prayer does little for a person when said out of a bitter heart... G.d will never honor hypocrisy, but He WILL honor Truth! 2. Be the target and servant while she needs it.
You are the one who needs advice... in being there for her. She does not... she needs to go though this w/out being untrue to herself.
Just my 2 cents that are here for whatever you think they are worth. And whatever you do... my whole point is to help YOU understand, not her. If she is hurting from this, as I am sure she is overwhelmed, advice is the last thing you should be giving her... so please, do not take my words and share them with her (neither should you share anyone else's advice with her... let her talk it out). She needs to work through this in her way.. :sad:
Edited to add: Just wanted to clarify or you may misunderstand... as I am sure she will not be bitter or angry with you.. just as I was not with my friends... I was speaking specifically of anger and bitterness toward her folks and possibly even herself. If you feed her with cheesy comforts and advice, you could make her feel like you are just trying to shut her up. Even when she asks you, turn the question around on her.. this will be a HUGE TREASURE in the long run because it will teach HER to learn how to handle devastations. Capish?