I think you have answered your own question. It is bullsh!t.

Follow: She is having trouble with her new person. She was horribly abusive towards you before that. Her reason for moving back communicates blame: "Well you brought me here, it's your fault!" Perhaps her new person is on to her emotional games, or perhaps he is an even better manipulator than she is, so the ex wants to return to a place where she can have her version of control over another. Regardless, she is already beginning this process by blaming you instead of taking responsibility for her own decisions. She is also beginning this process by putting you in a stressful situation. My guess is that you have grown beyond this and you are moving forward. Don't look back.

She's guilting you into letting down your boundaries, which must be causing you stress. Don't let her do that (probably easier said than done). It's your place, your life, and you have a perfect right to choose who may or may not stay with you.

That said, I hope your holiday is a peaceful one (as much as can be).

for the love of Bob keep her away. my problems with my x started many years of anxiety, it wasn't all her fault but it was a trigger and a lesson i needed to learn. now funny enough i am friends with her today but at a safe distance and i had to spend some time away to get my shit together first.

just remember, it's not your problem, sounds harsh but it's true.

listen to Some Tom Leykis if you really need help (google it, he has a webcast too) , he is sometimes too harsh or blunt but he's probably what you need right now.

Honestly,
I go through things similar to this. My baby father is locked up but whenever he usually comes home first he wants to be together then go on breaks and shit... I love him to death and all but I dont have he strengh to leave him. It seems as if you had the strength to leave the situation once... For everyone who cant do it and leave... LEAVE THE SITUAION ALONE! Ex means she was exed out... And there is a reason... Nobody should be anyones fall back. Now what if you two get back together and her and her other man start to talking? Then she leaves again? You have kids right? Dont let them watch that! If she needs to crash let her... Just dontt set yourself up and try to act happy when you know thatt time has come and passed!Oh and if you did bring her here she had the choice to make!