I actually sent this possible match into PSP on March 7, 2005. In looking at the old email, I used the link (no longer works) to the City of Frederick site. That must have been right around the time the girl in the trunk was being added to DN (City of Frederick site is a source). If she had already been added, I would have used the DN link.
At that time, also noted in the email, Anne's dentals were available through LE (this was pre-NamUs). If and when they were uploaded to NamUs, I don't know. But I have a hard time believing that, in the intervening 17 years, with other people apparently submitting the same possible match, that it hasn't been looked at. Could be she was ruled out years ago (by dentals or the collarbone), prior to NamUs, which would explain the rule out not being on the exclusions list.
Of course, over the years LE folks have transferred, retired, moved on. Others take over and may or may not have even looked at the case and may not even be aware of the possible match and/or rule out.
JMO and 2 cents worth.