Why the drunken phone call then no contact or did my indifference to her moving trigger her.
Alcohol lowers inhibitions, as we know, and contacting an ex while intoxicated is called a Drunk Dial, it's got a name it's so common, hell I've done it more than once, usually embarrassing later, especially when it's in writing and whoever it was decides to share it around. And then throw in the borderline trait of hating to lose an attachment and it makes sense.
Good for you for waiting a while to return the message, the fact she called you immediately is more indication she was looking to see if an attachment was still in place, and good for you for being indifferent, the best way to indicate to her that it is no longer in place.
And you posted about it here, are you really indifferent or is that just what you showed her? Assuming of course you don't want a relationship with her. I got a letter from my ex years after I left her, the letter being full of idealization and it triggered me, but I considered it a challenge to see how fast I could get back to grounded, and was proud of myself that it only took about an hour, where a few years ago that letter would have run around my brain for weeks. Progress, we celebrate the progress... .
Take care of you!