It didn't sound at all like she was willing to. It is great that she has friends, but why wouldn't she compromise on her wording. For example, she was getting really pissed (can tell with her slapping the couch repeatedly) that he likes to relax on Sundays. Why doesn't she bring her friends over first to meet him? Why does it have to be Sunday? You know unwinding and preparing for your work week is important to him, so why not say at some point down the line maybe we can go to brunch. With her personality being aggressive about the situation isn't going to help. Don't get me wrong, his personality is very conflicting as well (example: on the episode he was getting upset on the honeymoon because she wasn't being assertive enough to find out more about him personally, yet he asks what her favorite thing was about him... She replied with your smile. How will this accomplish a get to know me stage if all they know so far is their physical looks?)Also on the flip side, it didn't sound like she was compromising for him as you suggest he should compromise with her. His tradition of not doing anything on Sunday (I have to admit the no talking thing was dumb, think he was saying it because she talks all the time) is equal to her tradition of going to brunch. What I heard from her was she was still going to brunch regardless, which is fine (everyone needs friends), but he has to disrupt what he wants to do?
I think the argument can go both ways, but in reality (even married couples) should have their own hobby or "tradition" whatever it may be. Trying to force someone else to do something they don't want to do is far from a compromise, In fact it should be encouraged to have a hobby. Now I'm not taking this to an extreme and say to do it (the tradition) everyday, but once every 7 days is only about 4 times a month. Is that too much to ask for as an individual? I would suspect since Monet is really independent, she would understand this more than anything....
That being said, their communication skills are horrible. It is awful to see two people start an argument over something so ridiculous. This is why I think Monet and Vaughn will not work out. Watching this couple is the worst part of the show for me, it's like hitting a tension light switch when they get their 15 mins (yet I wrote about them... LoL).