Right now, it's mostly continuing to follow her orders from the Empress while getting more and more upset because she hates her orders (finding out that there are actual children in the area will probably not help). She may start looking for a way out of her predicament, but she doesn't expect to find one and she's certain nobody will be sympathetic because she's essentially prioritizing one innocent mermaid (who she did admittedly promise to protect from all harm) over many. She may also be starting to get antsy because the Deepsinger's eating all the dolphins and she really doesn't want to have to start hunting humans, especially as the only ones around as far as she knows are with the Cornu, the Pulao, or the Crownbreakers, and it's poor form to eat your allies.

Basically at this point I know more about her mental state than what she's actually going to be doing, which I know is less than helpful.

How sapient is the Deepsinger? Does it have anything approaching a will of its own at this point?