"Doesn't make sense", depends from how you played.
You have two extremes, from "resistance at all cost almost nun" (did not try, but it is possible to go in that direction, well, aside the fact that she does not dress like a nun
), to the extreme of basically giving up completely to the influence of the artifact.
Even at the pool, one thing is if she teased him with words, another it is if she had been doing the "help him" and "let him massage you" (don't remember the exact words) options. And wine above a certain level, even without being waisted, does reduce inhibitions.
So, whether it would be so strange, or it would naturally take only a thought ("like charming attractive nice guy"), depends from how you played before.
Not everybody has chosen the same identical path as you (if you wonder, no, I did not make mine go all in from the start, I got good level of lust, but also some resistance) - plus, since you mentioned it, remember she actually has the artifact in her bag when she goes to the dinner, so she can be influenced by it.
Plus, even if she does not want to fall under the entity or the creatures in her dreams, that does not mean before finding the artifact she was the Holy Virgin Mary with all the uppercase
(for the ones who know the reference) and not sexually active.