I am not saying she needs a 20" vertical to be successful, but a 2" vertical leap makes her far less effective as well. Hopefully with strength and conditioning she can get a couple more inches of leap, and I don't know what your definition of plodding is, but her 4 second "fast" break sure looked like plodding to me and I was surprised the ball did not have a flat spot the way she pounded that dribble slowly up the floor.
Bottom line, she looks like a Rikki Woltman level player, maybe better, maybe not as good. Nothing in any of her videos including ones you did not even link here shows any quickness, speed, leaping ability, or quality ball handling. She's big, strong, and has a nice shooting touch against players 6" shorter than her. What she will develop into in college depends greatly on her work ethic and the quality of coaching she receives IMO.