Gosh. It seems a little silly but I don't think it's big change in her character.
Tav has to suggest hiring sex workers and then SH response is "well if we are going to involve others let's involve Halsin".
Again, she expressed openness to involving others at during the wine dialogue and if anything it seems consistent with a desire to be the primary in a poly relationship. She's happy to be with people who don't threaten her position at the top of the relationship hierarchy.
Quote
All of this can happen even if player rejected Halsin outright.
