I'm with others who have stated concern over your mom being a hoarder. My first thought while reading was, "What if they get there and there's no room?" If you could somehow find out what the house looks like right now, I think it would help you immensely in this decision. Getting pictures is a good idea.
I know you are in a very tough place right now, and my thoughts and prayers are with you. I tend to err on the side of caution and choose the most stable option for the entire picture (mil?). Could you go there temporarily, let dh finish his classes, have the baby, and then scope out CO a bit more (maybe go somewhere other than your mom's or really see what your mom's house is like)?
THere are no easy options here. I'm sorry you are going through this. Please continue to vent, as we are here to listen, and it's healthy for you and the baby to get it all out. :grouphug::grouphug::grouphug: