I’m so sorry about your friends and pets. I’m not a veterinarian, but I think the trembling may indicate pain. I have watched two people waiting, trying to stay alive until a loved on arrived on their flight. Though they were in tremendous pain, the held on by sheer will power. All through their waits, they trembled. I am crying as I write this. Please understand your pets loved you—I ask you not to let them go through pain because of indecision.
I have decided. As long as she is eating, I’ll wait a couple of weeks for my son and daughter in law so they can drive us to the vet. She doesn’t tremble in her crate (except during a seizure), I think that’s because she feels safe to move around even though she cannot see, she knows where everything is, food, water, pillows, door, etc. It’s a huge crate, I didn’t use it much at all until she went blind last weekend.