She is insecure whole act 3 though. Still the way she places emphasis on "swan" line makes me believe that she is not fine. And after this she just accepts that she has to deal with it and only asks you to ask her first if you plan to do anything like that in the future. Also her acceptance is played perfectly in the last line when she responds to "And you would've said yes?" - "You gotta eat. What do I get from denying your appetites?"(She doesnt say yes. She is also sad when she says that btw).
She is insecure, but not to that extent. And the way it's written doesn't sound like how someone who accepts it only because she's afraid to lose you would reply, in my opinion. The "You gotta eat" line is literally a synonym for yes, even if reluctant.
And I do not agree that Jennifer's line delivery there implies sadness, or disappointment. Only the line she throws at Mizora has some semblance of anger to it. The rest sounds playfully sarcastic. She sounds disappointed if you walk away from her during the act 1 romance scene, or don't kiss her (failing insight check ftw), or break up with her by just leaving when she asks you to choose between her and someone else in act 2. And a plethora of other scenarios. She sounds sad during her final story cutscene, and during the start of her epilogue chat (no parents version). Compare those situations to the Mizora one and you'll know what I mean. Then again, I'm no expert voice actor, this is just my interpretation.
