I'm on the fence with prologues. I tried not to write one for the book I'm working on and work the info into the first chapter, but my critique group suggested that I break it out and write a prologue.
I guess to foreshadow or not would be how much this is going to affect the MC afterwards. And if it is going to be caused by the MC, how aware are they of the potential danger to this character? Personally, I would foreshadow it at least a bit, but I think I might have gotten too annoyed with...
I like Heliotrope's post.
As for me, where I have a MC that doesn't like to talk much, I rely on physical actions to demonstrate her level of frustration (or whatever else I'm trying to convey).
If I find I'm having a hard time with a character, I'll pull them into a side story (usually doesn't end up as part of the main story) until they really start talking to me. Not sure if that will help you out or not.
I joined a while ago and tend to lurk, but figured that I should probably say hi.
Right now I'm working on my first novel. In the process of editing. Not really sure what else to say outside of the people in my head made me do it.