If this is her second offence, this will permanently ban her from Hypnospace.
(Re)visit Sherri's Consultation Price page (via using the previous e-mail sent to you or cracking the difficult password ( "AsburyHealing1937", casing optional)) and re-enforce the Extralegal violations on the page, enough to (re)flag her.
Report the last image of ThatBrassyKid's chat logs, and the bottom 2 of ZANE_ROCKS_14's chat logs. Visiting DarkTwilightTiff's main page greets you with a gigantic "DEAR HSPD ENFORCERS: PLEASE LOOK." link that can otherwise be crawled by searching for its related terms.
Either way, report the Malicious Software on the download page. You can solve this by completing the Test in the Freelands, or otherwise obtaining Axxelerator via Roddy Wall's FLST and opening the About page. You will get this Case automatically after finding and completing 2 other Cases below.