Pardon the intrusion. Though you may already be aware of this now, what I think she's trying to say is when you said Foal=males, she assumed you meant that Foal = young male ponies and young male ponies only / excluding the young females. She's trying to tell you that the way you worded it made it sound like such, and she's correcting you by saying that the term "foal" does not exclude females; for it means both young male and female ponies. I apologize if you are aware of this already. I don't mean to be a bother. //rolls away
Uhm... Fun fact, males aren't specifically referred to as foals The common misconception is that a foal is a colt, when in fact, it isn't. Foal is simply a general term for a horse (male or female) under the age of one. Whereas Filly is specific for a female under the age of four and Colt is specific for a male under the age of 2. [link]
Well, when I first saw the "new" Luna, I thought that her body shape has changed into more similar as her sister Celestia. But now I realized that the change was only about the color, mane and eyes (and possibly she grow a little bit?).
Uh... I think you're a bit turned around there, buddy. Yes, I was aware that a male baby horse was a colt before I even created the tutorial. But as you say, a 'foal goes for both genders'. So in this case, I wouldn't say it matters. Even if I refer to it as a foal, it's still gonna be a colt.