Ilithyia's End Game (spoilers for s02e09)

Why did she save Glaber? I know she bears him no love.

My thoughts:

1. Revenge. She is going to make Glaber desire her again, only to deliver him into Spartacus' hands.

2. Survival. Saving Glaber somehow ensures her own survival. But this is hard to see... she can easily re-marry, and her child is an heir to both Glaber and her father's estates. Why does she need him?

3. Influence. Maybe Glaber is a useful tool, and she believes she can influence him.

Lets hear your thoughts, because I am honestly stumped.