I also think like that.
Spoiler (sort of)
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I honestly don’t think she ever faked it with her. She faked being nice, but she didn’t hate Latte until she started stealing attention away from her. She seemed unbothered by being with her, and at some points seemed to genuinely enjoy being around her. That being said, she doesn’t like her enough to take initiative in their relationship. Latte was likely more of an amusing follower than a friend. She liked her because she flocked to her and gave her attention. Evelyn lives for attention.
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I think Ibelin is being faked with Latte and actually hates her or maybe she is jealous that she is not receiving all the attention