First, I wanted to say what you shared is plenty appropriate

sounds like things have been pretty crazy on your end, I'm sorry that I dont have much advice, but one thing,

about the 6 year old. Has there been any way to figure out why she has been crying? Maybe you could set up something where you live so that if the 6 yo comes out, there are games to play, like coloring... something, maybe something you liked to do when you were 6. That way there's a chance the she will see the "toy" and maybe get distracted with it

If you can talk to her, keep saying she's safe, maybe tell her she can play games... anything to make her feel secure.

For the depression (I have major depressive disorder).. get yourself out whenever however you can, try to fight it, that horrible cycle. Know its hard.

sending loads of hugs