[X] Tell her to help if she's so interested in you, you can talk later.
[X] "Student to [Songstress of Endings] entreats aid for later negotiation."
We won´t be taking her Prisoner, since that would be diplomatic suicide for no gain and we do not have the means for it currently anyway.
Secondly I would like to reiterate that Winterlady, who hails from the smallest faction, specifically asks LQ if she needs help. No Spirit I know would do that.
Winterlady also asking for Heritage is also specific and diplomatic leverage to be used in any discussion with her.
The Winterlady also begins this interruption with isolating LQ and Winterlady from the rest of the fight and then mentions Heritage and aid. NO one who wants to just see LQ fall would go to such length(That Wall of Ice can´t be cheap in qi), just to rob us in the next scene. That just straight up doesn´t make sense.
Also, we only have Zequing as a datapoint for behaviour of Ice spirits and anything Ling Qi sensed could always be distorted through her personal narrative lense. We do not know if the tradition of the Winterlady is more or less possesive than Zequing, but we do now, thanks to her actions right now in the quest, that the Winterlady herself is interested in talking. Ling Qi was hired by CRX for making friends in weird places.
I therefore conclude Winterlady is offering aid in compensation for knowledge of her heritage. If she is so interested in LQ personally, then she has a personaly interest in seeing LQ leave this battle alive and therefore should, at the very least, help in the defense of the stone.
I also don´t get all the people assuming she is here to do us harm. Harming LQ would be easier in cooperation with the 12 Star confeds. and their reinforcement.
What would her endgoal in harming LQ be? Remember, Winterlady used no small amount of Qi to facilitate Diplomancy, which is highly unusual on the battlefield.
I vote for these Options, since I think we should assume Innocence before declaring her and her entire faction enemies. She made the first step towards diplomancy and could potentially be another weird contact LQ seems to collect like cards in a rare cardcollection. Let´s show LQs diplo chops!