Charges weren’t dropped. Neither the judge nor the prosecution sought detention, so she is just out until the next hearing happens (May 15th).

From: https://www.msn.com/en-us/news/us/milwaukee-judge-hannah-dugan-charged-with-2-federal-felonies-in-ice-case/ar-AA1DCrnR

On April 25, Dugan appeared before U.S. Magistrate Judge Stephen C. Dries during a brief hearing in a packed courtroom at the federal courthouse. Dugan, wearing a black dress with white flowers, made no public comments during the brief hearing.

At the hearing, Dries asked if prosecutors were seeking detention, and they said they were not. He answered that he did not believe that the charges were “eligible” for detention.

As it ended, her attorney, Craig Mastantuono, told the court: “Judge Dugan wholeheartedly regrets and protests her arrest. It was not made in the interest of public safety.”

Dugan made her federal court appearance a little more than two hours after she was arrested at the county courthouse at about 8 a.m. April 25.

The article didn’t explicitly state it, but she was probably released on her own recognizance. (In other words, she pinky-swore to come back for her trial).

Bail is just a tactic to compel the person to come back to court and face their charges by forcing them to pay a fee which they don’t get back unless they show up. This lady is a judge. She is unlikely to disappear before her court date, because it would affect all the cases she is in charge of.