Adding another horse is not an option, unfortunately. I was thinking about it, but no space/resources for the 3rd one (I have rather small property). :( It may be separation anxiety, that's my guess as well, but is it going to go away or not with time? BTW, same was happening at previous farm, where there were 4 of them (just not AS bad). It's weird in way that when I bring other horse back, the one in field try to go out from the field. If it's paint I'm brining back, the qh wants to kick her butt (so I usually back her away pretty aggressively).
Appy, how they can be worked out together? I assume should be another person around at least.. :) Or there are other ways to deal with it?
Delete, I don't quite understand how running in field is related to only one person can ride the horse to sending to slaughter?