Ah yes, but you ignore the context.
Firstly, RS had already mentioned in a text message that he planned to reveal her feelings for him (very soon). She was stringing it out, waiting for the opportune moment. Making him wait. That isn't the way an abused partner would do it. Rather she was in complete control of how and when she wanted to reveal this. It was not some sort of knee jerk reaction uttered out of a desire merely to placate him.
Secondly, this was clearly and unambiguously a declaration of her love for him. In speaking of the "right moment," she was telling him she had fallen in love with him. Had she just said, "I love you," you wouldn't necessarily know for sure, you're right. But what can she mean by "the right moment", other than the right moment in their relationship with one another. If she had been planning to leave him, then t it was utterly the wrong moment in their relationship to say she loved him.
Thirdly, I have no doubt whatsover that these two people were very much in love with each other.