She has a long swing with some bat drag, but gets away with it against pitchers that don't have the elite level velo/spin combo. Bat drag tends to make you late against good velo, so you have to subconsciously commit earlier, which then makes you susceptible to anything that's not a fastball. And it's not a matter of just learning to layoff or getting better vision. It's a mechanical issue. I'm a little surprised it hasn't been cleaned up in college, especially in today's world where there is so much emphasis on hitting mechanics.
To illustrate, here's a swing from her last night. It's an outside pitch, where everyone tends to get a little draggy, but notice how her back elbow slides far forward of her back hip and comes almost completely under her top elbow, with the bat dragging behind. These are not great mechanics.
Reese has much better mechanics. Great connection between elbow and back hip here.