Cushing is very complicated.
I always thought that I had some type of adrenal insufficiency, since my cortisol and acth are low in the morning. But at the same time I had more cushing symptoms. I also have a pit tumor and am secondary hypothyroid and am in the process of getting diagnised with growth hormone deficiency.

and to think I just thought I had a little thyroid problem.
Anyway, I went to lots of docs who said there is nothing wrong with me.
I had a saliva test show low am, low pm, and not too high but higher midnight. My urine and blood cortisol and acth's were all over the place.
After a few years of this I finally decided to go see a specialist in Los Angeles.
I wish that I would have spent the money and h=gne to him right away!
He believes that I have cyclical cushings. He thinks the tumor may release too much stuff in periods. Which explains my syptoms. It does seem to me know that I am getting more regular cushing symptoms.
My problem cold also be GH deficiency or both.
So, for now I do 24 hr urines and midnight saliva tests.
This can be a lond tedious process.
But, at the same time you both already have elevated cortisol.
I would not take it lightly!!!
Like Me, the docs are MUCH worse at this than thyroid.
So if I were you girls I would go to a specialist, a real specialist.
I would also insist on an MRI of brain with and with out contrast, dynamic if possible.
If nothing shows there tehn ask for a scan of the adrenals.
I really don't know that much about cushings, but it does seem to be progressive, not everyone has all the symptoms(bruising, stretch marks).
Good Luck to you both and please find a good doctor!!!