could happen if its just intentionally anaerobic and meant to build up their wind. running timed 400's and miles, or just a set of sprints for a set time. 8-10 12 second sprints with a short break between.
i've had it done to me both ways -- as punishment and not -- but it's not always just...
swing at everything your bat will reach. but if you want to rattle her do it with the short game. make her field some bunts and let her throw em away. run at her and slap with a runner on third. she'll very likely stop in the middle of her windup.