Hi There-
SO glad your LO is feeling better!
Let's start at the beginning if you are ready to help her get back into a good pattern. FWIW, at 14 mos we had some SA going on, and I used a GW and WIWO approach- just tried the WIWO, and if he needed more support, used GW for a few nights. It took a few weeks, but he did get back into the pattern.
I always told him, "it's time to sleep, Mama is tired too, Mama wants to go to sleep, rest your head," etc etc etc. Endlessly WIWO, and laying him back down at times.
I sometimes sat in a chair next to his bed- and quietly waited for him to drop off. I've slept on his floor. It really depends on what works for you and your situation.
If she is one that already self-soothed at one point, it will come again soon!
Maybe post your schedule too? Sometimes people have good suggestions for any tweaks to help.