The word "possible" is highly relevant, since Bravo has a right to lock Leviss in at the rate mentioned in her contract. It's not uncommon in the reality world for some cast members to try and get a bump, but Bravo could reject that and Leviss would still be bound by her contract.
There is a wild card. TMZ broke the story, Leviss left the mental health facility she called home for 2 months about a week ago. Although we're told she's doing a lot better, she could almost certainly quit the show if she felt it would compromise her mental health and a doctor agreed.
In case you didn't see our story Friday, she's now going by her government name, Rachel, because her therapists convinced her all the detractors who are using that name as a slight would be disempowered if she embraced the name.