I just feel the need to say, I think a Lion named Mittens is awesome.
As one of those players who would avoid tavern stuff since my PCs don't drink or want to deal with people when they do, I'd be annoyed if the ENTIRE session ended up being in the tavern scene and I didn't get to do anything. Part of a DM's "job" is to make sure players have fun and to give them "spotlight time," usually a chance to shine but in this case...a chance to do anything at all.
I've had sessions where it ends up being a long combat that eats up most of the night and I get frightened or paralyzed or something early on in it. Coming to your once per week (at best!) game and ending up sitting it out kinda really sucks.
I guess what I'm saying is, I don't think she was upset because she chose to do nothing, she was upset because the DM didn't provide her with anything to do. "Go join the party in a social situation that you/your character will hate or do nothing at all" isn't a real "choice."
They were going to the tavern to meet with a bard who had information on a NPC who had gone missing. They were not going there to socialize. After that they went on to check out a place that the bard had said the missing NPC sometimes hung out. They the party choose not to go back and get the other PC. I think the majority were irritated with her refusing to come in the first place.
They got into a combat that took the rest of the session.
As for getting paralyzed in combat yep it sucks when it happens but it is part of the game we all choose to play.
Part of the job of a player is to engage in the game and not sit around expecting your DM to come up with an excuse for you to do something. It is a two way street as the DM I come with ways for the players to shine. In the combat I planned I put in an encounter that played to the wife's strengths and I was a little frustrated that she pulled the I am going to stay in and sew.
Let's say that a night of gambling and drinking had been on the agenda by not joining and and saying I stay in my room sewing how as the DM am I supposed to come with something for her to do? First of all she was in a shielded temple that is almost impossible for an outsider to get into. Should I have had her make rolls for how well the sewing was going or if she pricked her finger on a needle.