What is exactly wrong here? They checked your passport and went on their way, that is how it works.
1) She co-founded a hemp drink company in California as a Canadian.
"Jasmine Mooney, an actor who is also co-founder of the beverage brand Holy! Water, was detained on 3 March in San Diego, California."
https://www.theguardian.com/us-news/2025/mar/18/canadian-act...
2) She applied for a TN visa that was sponsored by her own company, which is illegal.
"I was granted my trade Nafta work visa, which allows Canadian and Mexican citizens to work in the US in specific professional occupations, on my second attempt."
https://www.theguardian.com/us-news/2025/mar/19/canadian-det...
3) She self-sponsored her own TN visa through her company that she co-founded and this is illegal.
Visa Sponsorship Required
Contrary to popular belief, the TN visa classification does require an employer to “sponsor” an individual for TN visa work status.
The TN visa classification, unlike e.g. the E-2 visa, does not permit self-sponsorship.
https://www.bdzlaw.com/nafta-tn-blog/tn-visa-employer-obliga...
4) She was trying to enter the US illegally with an illegal work visa and even though the first TN was granted, she was likely detained because of the illegal nature of her TN visa application and the multiple attempts she made.
Everything ICE and CBP did was lawful.
Curious how you determined
>> A professional will be deemed to be self-employed if he or she will be rendering services to a corporation or entity of which the professional is the sole or controlling shareholder or owner.
Do you have a link to the ownership structure of Holy! Water?
[0] https://www.govinfo.gov/content/pkg/CFR-2012-title8-vol1/pdf...
Yes, if she was the sole or controlling owner, this would be an issue. But “cofounder” and “sole owner” are... not the same thing.