I do wonder if you just AP as much sleep into her as you can so she and Stan are as rested as possible for the training to begin with the SC... that will at least rule out chronic OT...
Has she ever slept in a bouncer/swing? Would she sleep better there? I know not an ideal long term solution... just me thinking aloud.
If you go into ST mode, I think these:
1. Rule out fluid in ears - this could be hanging around worse than usual after her illness.
2. Drop props that SC will pounce on - so no co-sleeping, go back to feed after 8hr, etc.
3. Keep the sleep environment consistent - so decide whether Stan is in the room or not for the week. Either way, it will be hard on him, but if it gets you somewhere, it will be better for him long term, having a well rested mum will make a difference for him.
Its not easy to see the wood for the trees when you're so tired and finding out why its not working for Audrey is stumping us all!
Hugs xx I know its not easy to decide what to do