She wasn't used at all so I'm not surprised at all by her release. However, I'm a little surprised that they haven't decided to go look for new Knockout to join the roster. I thought that they would've raided SHIMMER's roster by now and get rid of their dead wood.
On a side note, I don't know if her release could also be related with the news that broke a couple of weeks in which Kazarian had cheated on her or the other way around, whatever. Personally, I don't think it's related but with the whole Kurt & Karen Angle situation last year, I'm not ruling this possibility out.