[She considers it for a long moment--she considers agreeing to this and bringing Estelle, whatever the consequences might be. But...

Rita finally shakes her head.] I-I can't. You were the one who wanted me to keep the rune and the experiments a secret. [That's right; this is just another thing that Tyr can only blame on himself. Rita has nothing to do with it.]

It's best for both of you if she doesn't come.