I'm pretty sure she knew why Travis killed them, even if she didn't actually see it. I'd have to rewatch to make sure, but I think it's probable she knows Chris is dead. And probably has mixed feelings about it!
Same! I think she was so lucky she found Alexandria and then Carl and Maggie (and Glenn, for that too short time!). She so easily could have gone down a scarier path. I will have to check that out, it sounds great! Even though zombies actually freak me out. And yet I love TWD, go figure!