I get the same thing every day. When she occasionally want to talk about something, I stop all that I am doing, look her in the eyes and listen. Of course, within an hour or so, she's back to ignoring me. She doesn't tell me good-night or good-bye. I will say see ya tonight, and she says, okay.
I try to look at it as if it were someone I didn't know. I wouldn't care if she spoke, even if it were just being polite. Let her be.
I know you read my thread so you know I am having some of the same problems. I don't handle it as well as I know I should. I keep trying.