Season 5 Edit
Monica makes her first appearance in Mother, supporting Catherine while Mee-Maw is in the hospital. She is sort of a mother figure for Catherine, in a way. Catherine calls her "Moni", knowing it sounds like "Mommy". She appears again in Camp David.
Season 6 Edit
Following Andrew's reconciliation and subsequent break-up with Selina, Monica appears again in Groundbreaking, having reconcliled with Andrew.
Season 7 Edit
After Andrew's "death" in Super Tuesday, it's unlikely that Monica would still be with him.
-Andrew was originally going to propose to Monica in Camp David, but the storyline was scrapped.
-According to the DVD commentary of C**Tgate, Monica's last name was going to be Gellar, a direct reference to the Friends character of the same name.