You cannot stop her leaving.It is out of your control. Cross the letting her back bridge when/if it arises. For the moment she hasn't even left.
Reread the detachment threads.
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together