Wow, that's super stressful! When I have extra-nervous dogs in my care, I give them more frequent (and longer) walks. 98% of the time it solves the issue. I understand that getting the leash on her has been difficult--now that you've spend a few days with her and earned her trust, is she easier to leash? If she normally wears a harness for walks, maybe you can try to just quickly leash her collar instead (temporarily) just to get her walking. Or have the leash on the couch, ready for when she comes to you for pets. With leash-shy dogs, it might work to have something distracting in one hand (something she'll want to sniff, like wet food) could divert her attention away from the hand doing the leashing.

I hope this is coming across correctly! I don't mean to assume you haven't tried or thought of these things :)

Anyway, these symptoms just reminded me of a suddenly under-exercised dog (as compared to her usual routine). I'm also curious about her breed.

Best of luck to you, your husband, and the pups! Hang in there!