WI is an at will employment state. You can fire someone for any reason you want as long as you don't do so for a discriminatory reason (age, race, religion ect). You can also contest unemployment based on her behavior.
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You most definitely can.
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Wisconsin is an "at will" state. An employer can fire you for any reason except a prohibited reason. I don't see any prohibited reasons mentioned. You might want to contact an employment lawyer about this.
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I wouldn't be so hasty! You don't state everything she said in the text message and there's something called "concerted protected activity" which protects some employee speech in the workplace. I'd discuss this with an employment attorney and be sure to provide the attorney with the entire text. Just because she called you a "b*tch" doesn't necessarily provide 100% grounds for termination, believe it or not. The NLRB is getting aggressive about employer's firing employees for their speech.