Juliana & equipment weigh 298 lbs. Add saddle, bit, bridle and saddlebags, and she's well over the 301 lb medium weight for a heavy warhorse.
Juliana charges the orc. It manages to get around to the far side of the second shed before she can skewer it. She slows as she passes the shed and doesn't see the orc. It seems to have gone into the shed. The shed is about 15' by 15', and has a wide open door, but Juliana can't see inside.
The mounted warrior closes rapidly. It is another orc on a heavy warhorse. It is charging with its lance. The metal tip deflects off Juliana's armor, and the horse carries its rider on past. (Ride-by-attack)
The archers shoot again. They are definitely in the trees, some 100 feet away to the West. Again, one of the arrows clatters off her mail, but she is not injured.
Atop the hill, Aif and his farmers pause to examine the dead bodies, all of which seem to be farmhands. "Edgar, Tessman, Rufus...yes, they've killed our men." says Aif. At this point, Eusebius and Beamer can see Juliana battling below, several hundred feet away.