She is on a path out on her own, don't stand in the way. Know your rights and make a plan for what your options are. You need to watch the cake eating. Let her do the heavy work with the S agreement, but when the time comes you will have to do your part in it.
You have more control then you think, she needs you to sign the S agreement for it to happen. Don't back down on 50% custody with your D. Look into living options for you. Look at all options. Keep your head up and focused on your D and yourself. Keep going forward at your pace not hers. Don't let her push you to do anything you don't want to do. Do what is best for your D and you. She is not a factor anymore.
Me late 30's W mid 30's T 15, M 10 S4, S7 ILYBNILWY June 2015 In house S July 2015 W rings off Oct 2015 My ring off Feb 2015 Separate houses June 2016