Crowd sourcing is an amazing tool.  If it was my kid I would not wait on the single investigator looking at a stack of cold cases.  Post up every detail on FB page.  Locals can help you solve this.  To many variables in this vague article.  Need more facts.  Was she actually in Girdwood or not?  Are there facts that truly put her there?   At this point what do you have to lose?  Crowd source the information..