Constance is lovely! Is she an Arab?
The hives are nettle-rash, and regardless of if it's actually caused by nettles, is a common allergic reaction. Seasonally, she's eating something that she's a touch allergic to . The vet can prescribe antihistamines, but you should look around and see if there's a plant she's eating then or if her hay is coming from a different field.
The lines have been bred for different things for long enough for some people to be utter snobs about it, (which doesn't actually take that long!) and consider a cross between them a "mutt".
And while I'd love to buy a male, I already have 3 dogs and 2 kids in an absurdly tiny caretaker's apartment, and if I both got a male and kept a puppy, I think that might be enough square footage in dogs to literally carpet the apartment when they all lay down, lol. But what really stops me is that a good quality male from health tested parents starts at $1,500
Of course!
Waaay back, long before the movies were a thing, my Dad started a family tradition of always having a pet named from Lord of The Rings. I think he's be proud of this one, because, the way that gray horse's color works, one day Gandalf the Gray will become Gandalf the White