at least this one is PPP which is probably what I'd use for a surrogate too. I've seen an EWW being used as one and clutched my pearls, because how many of those you need to have to consider them inferior for breeding themselves?
well when you pull an embryo off a mare that mare cannot breed herself during that month so she needs another one to carry it for her. And in my case I have stored embryos from mares that are now retired and can't give birth anymore. The embryo needs a "mom" so to speak, it's not like a pokeball where you throw it to the ground and a foal pops out
it means she had an embryo implanted this year, probably from a much higher rated mare and therefore cannot have a foal on her own. it will reset on the 1st of October