My feeling last year was that she was too foul prone. She would enter the game, commit multiple quick unproductive fouls, and have to go back to the bench in a short time.
I rarely agree with the practice where you look at a player's performance in the current year and say "how come she didn't play more last year, then?" The answer is almost always, "because she's improved a lot since then." Gerry Bohannon is another example to me. If you thought his play last season was anywhere close to what it was this season, I don't know what games you were watching. I don't think Jaden's improvement was as obvious or dramatic, but I don't see her committing as many unproductive fouls.