Thank you everyone for your posts!
I have carefully open the underbelly on the affected area (12" x 18") and pulled out all the wet isolation, no visual water damage so far, and no other area has wet isolation.
I will tuck that isolation back in after it will completely dry and gorilla tape it.
Again - thank you for all your help ans support.
BTW, I was amazed how much water isolation can absorb! like WOW.