Get Beth to go on a date with you. Her Affection has to be high, if you pissed her off earlier you'll need to do a lot of shoveling...you're not bugged, Everi doesn't get out of bed till you advance the story with other characters, Mia and Beth IIRC. I forget the exact sequence, but you'll get the idea to do something that involves Everi's help, which will be her cue to get out of bed.
The only way Mia ties in with anything else in the game is with Frida. You need to (sucessfully!) ask for a dire wolf pup to give to Mia before Frida will give birth. If you're not following the giants storyline you can safely ignore Mia's storyline. Same after the pup is delivered to Mia.