Be cautious that you don't over milk her.
Have the vet on speed dial, minis are notorious for foaling complications.
Why do the previous owners not have a breeding date? What was she bred to?
And mares don't always follow a rule book, some don't show any signs and drop a foal. Others can give every sign of impending labor (baby dropped, full udder with milk ready, relaxed elongated vulva, etc) and not drop the foal for weeks. Good luck on foal watch and don't take your eyes off her for a moment. Minis are high maintenance when it comes to foal watch.
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