I will admit that I haven't watched every season of LWLA, but even in the first season Terra didn't like Christy. I vaguely remember Christy's drinking was part of Terra's dislike, but why does she not feel comfortable with Christy coming to her house?

I saw an episode where they went to the mountains (where Matt had sex in the hotel bathroom with a stranger), and Terra was pisssssed that Christy came too.

With Terra's scheming personality and producer credit, I'm surprised she hasn't gotten Christy fired.

Also I think Christy is way more likeable than Terra's husband Joe. I'd be fine if he didn't make appearances on the show anymore.

TL;DR: What's the history behind Terra's dislike of Christy?