It was "human error" and she's "sorry" about it.
Can you sense my eyebrows being raised?
One thing I can tell you is that when "mistakes are made", the first thing that an information hoarder does is fix everything before reporting the mistake.
I think there is enough here to launch a serious investigation. Not just a recount, but a criminal investigation. The fact is many Wisconsinites will consider this fraud unless it's proven otherwise. That may not be fair, but it's a fact.
Kathy Nickolaus needs to answer a lot of questions. Her computer should have been seized and locked away as soon as the error was reported. It should be given a thorough forensic exam. When did she realize the mistake? Did she change anything in any file after she discovered her error? Who did she tell and when? Why didn't she just tell the AP right away if it was an honest mistake? Did she have access to any of the physical records like ballots and election logs? (I presume she did, being the clerk.) Where were those documents over the last two days? Did she alter them in any way?