YES! A new chapter for Christmas! Thank you so much!
Now, as for the chapter itself, guess is that she'll agree(lie) to join them, and then either shoot all 3 of them in the back, or that she'll wait to be in an advantageous position to kill some of the higher-ops of the Liberation Army.
Either way, she hates both sides of this civil war, with the people and city vigilantes who are caught in the middle being the only ones she doesn't outright hates. So she might actually join the Liberation Army just to get a chance at killing higher-ups of Island Army and then afterward kill the ones from the Liberation Army.