June is only 2 - she's just a baby herself. Getting another youngster would be sort of a case of "the blind leading the blind." No doubt she is used to being pushed around; but as easygoing as June seems to be, if the foal had any real spirit to it, I fear she'd be such a pushover that the foal would soon be dominating her. And that isn't a really good place for a youngster to go, if Syd is anything to go by.
Syd was weaned at 3 months, because her owner was eager to sell her mother. Shortly after that, she was introduced to Betsy, a 32" mini mule. Betsy became Syd's surrogate mother. A few months later, the owner got tired of the acts of hooliganism the pair were getting up to, and gave Betsy away - to me. A couple of months after that, Syd also came to live with us. When Syd moved here, Betsy was the boss, and things were relatively peaceful, but eventually Syd decided to become the boss mare. Betsy is a lot smaller, and clearly didn't care that much about the matter; the transfer of power was relatively peaceful . . . . until Syd decided to try to dominate me. Big mistake. BIG mistake - as Syd found out. Fortunately, it isn't that hard to convince a 40" pony that you are tougher than it is, and it had better not mess with you . . . .
Unfortunately, though Syd quickly understood that she had to respect me, that didn't extend to anybody else. As I told my daughter, "I can tell Syd how to behave around me, and I can tell her how to behave with you when I'm around, but you have to tell her how to behave when I'm not around. You need to be the boss. And really, Syd needs you to be the boss, too, because she simply can't be allowed to go around thinking that she gets to push people around." For years, we jokingly referred to Syd as "the man-eating mini," because she would charge people in the paddock unless I was there to tell her not to. She's a lot better than she was, but Syd is still a brat - it seems that every single person that she meets has to tell her all over again just where she stands with people.