This sounds like horse shit. They couldn't check her drivers license and registration? Also:

Responding to Brock's lawsuit earlier this summer, the city claimed in court filings that she had been "acting irrational, she spoke incoherently and inconsistently, and she ran into the middle of traffic on Eighth Ave" during her encounter with police.

That's from the huffpo article. So I guess we will find out when more comes out.