She is allowed to do it, although it seems it's "odd" to not at least have an evidentiary hearing considering that KZ asked for a boatload of evidence to test and she only had access to a small amount at the point that she filed the PCB, but the laws allow the judge to make a decision without having a hearing. I have read that because it was such a short decision and only addressed some and not all of the issues raised, that it might help down the road. This is just going to delay everything and make it that much harder and it's unfortunate and was avoidable.
The best indication that it's allowed is in KZ's filing on Friday, she is asking for the decision to be vacated pursuant to Wisconsin statute 806.07 (1)(a)
806.07  Relief from judgment or order.
(1) On motion and upon such terms as are just, the court, subject to subs. (2) and (3), may relieve a party or legal representative from a judgment, order or stipulation for the following reasons:
(a) Mistake, inadvertence, surprise, or excusable neglect;
KZ is admitting she made a mistake.
There is no doubt in my mind that Zellner screwed up with not letting the courts know that her intention was to test more evidence and file an amended PCB. No way do I believe that she planned this and it's part of a bigger plan, but JMO.