First, tell her not to wear a hat. Whatever else happens, from that distance, you'll end up with a very nice picture of the hat. I doubt that's what you're going for.
If the sun is straight overhead, you're screwed. Not much you can do with that. But you mentioned 4:00. By then there should be a little tilt past the apex. Figure out where that is and work from there.
Most ballparks are laid out so the pitcher faces somewhere between west and south. That puts the sun behind the batter, behind the photographer at the plate. You can probably expect her face to be lit. 4:00 in the summer isn't ideal, but your camera should have enough DR to handle it no problem. You're not making a portrait of the queen.
So first 2 things. Find your light. Figure out what it's doing to faces.
Probably more than 1 person in the shot. Pay attention to what happens when they turn their heads or get into each other's shadows. There's nothing you can do about that, but along with pleasant expressions and open eyes, you need to be ready for those moments of synergy when everything in the picture gets turned to the right angle. They don't come often. You don't want to miss any.
See if you can line up a dark background. At the very least, look for something plain. You don't want an infield tractor in the shot, even with great bokah.
I wouldn't worry too much. They put the ceremony at the pitcher's mound and the photographers at the plate because that's the direction the team photographer and the league photographer and the local news photographer like to shoot. You'll be fine.