Right this moment she seems pretty happy, actually. Generally, she wants me to be near her and has been yowling frequently - she has unbelievable stamina - but especially when I try to do things that take me away, like washing dishes, showering or sleeping. That last is a difficult one for me in the short term - I am really short on sleep right now - but ultimately it's minor and I am confident that it will recede to her normal level of talkiness.
The more serious one is that she is eating almost nothing. I know she has eaten some today, because I put little dishes of kibble around yesterday and counted the pieces in each, and those counts had not changed this morning but there are fewer now. This is a huge relief, as I don't think she ate anything voluntarily yesterday (I fed her some wet food as if it was pills - she did not love that - because frankly her not eating is very scary to me, knowing how risky it is for her liver). I don't really know how much she ate in a day at the EH, so I don't know how much less than normal today was, but she was definitely skittish just now when approaching a food bowl. That, and the whole issue, could be travel stress or everything-I-knew-is-different stress or both.
I feel hopeful at the moment, but I will probably have a clearer idea when she lets me get some sleep again.