What are Christians trusting God about, when in fallen world circumstance? For example, a woman lives in a physically abusive marriage or a teenager lives in an area where a gang determines what they can and can't do. (i.e. - situations that are chronic and very difficult to transcend.)

They go to church and hear they need to trust God.

Should they be trusting that this is what God wants for their life or something else?

How can trusting God in these circumstances be justified?
What I would get from that (vague) statement is that, in spite of everything that I think is wrong or can't understand, trust that God exists - that I'm not alone.  Trust that as bleak and hopeless as things may seem, that God is still there, even if He doesn't magically make everything perfect.

There is much that I think is wrong and can't understand... but I also believe that God does have bigger plans or has a larger view.  I have to trust that, no matter what my pains, fears, or disappointments here are, on a larger scale or a higher plane or however you want to phrase it, God is still watching (over) and will make things right.

Note, I don't know what form "will make things right" will take... it may be as simple as "Welcome home, I know that was hard, but it's all over now."  And, technically, I don't "KNOW" that it will happen, but I BELIEVE that it will happen.  And that is the "trust" that I put in God.