For the record, I'm no fan of ICE/CBP, but it looks like they're just enforcing the law here.
There were people active in the San Francisco startup scene from multiple countries who would go for a 'holiday' nearby (mexico, canada, etc) for a week every 2-3 months and then get a new 3 month visa on re-entry. One of them told me that after almost two years of that he started getting tougher conversations at re-entry, but was still allowed through.
This is from 2010ish, so maybe things have changed. But it certainly isn't possible to just assume that she broke the rules from that description, because it hinges on extremely technical reading of multiple overlapping legislation and regulation.
Side note on people trying to reason outside their field of knowledge: any American who has never had to deal with visas for incoming people has a useless opinion. The US media on this is hyperpolitical garbage and grievance politics. Not particularly directed at the original poster, just a request to so many indulged Americans who feel informed and entitled on this topic while they are demonstrably wrong.