The primary goal of those quick subs is to get the player coming out a break without them missing much game time. That's why Clark is almost always subbed just before the mid-quarter timeout. I doubt Coach Bluder expects much out of the players in those short stints, or that poor performance in a short stint would impacts her evaluations of the player much. She recognizes it's a tough situation to throw them into. But it's a necessary one.
I wish Jensen the best moving forward, and can't fault her decision. She didn't play much last year, and we are adding two wings, one of which is almost certainly ahead of her on the depth chart going in. As Gabe said on the recruiting thread, she's still young and should have the opportunity to find playing time at another program.
