I started out reading the article wondering 'OMG, what is it that this mom could've possible done that she's banned?' and then when it says "lawyer at adversarial law firm" I immediately switched to "oh yea, makes total sense".
None of the counterarguments here stand up to scrutiny.
"Isn't involved in litigation" and "not a Security threat" - she is totally a security threat: today she's a mother of a girl scout and is not working on the case, and tomorrow she's a loyal employee helping out with the case.
"Part of girl scouts trip" - Does she have a firewall in her brain between personal and professional?
'Conlon said she thought a recent judge’s order in one of those cases made it clear that ticketholders like her “may not be denied entry to any shows.” - You know what the best thing about America is? Our endless appeal system.
This entire article is a non-story (someone denied access to a business), and yet, it's somehow making the rounds. The paranoid cynic part of my brain is interpreting this entire situation as "A law firm that sent in an employee for some snooping, and then got caught, and now is making some noise in the papers." The lady doth protest too much, methinks.