I don't know the family dynamics, but that is a long time between last seen and missing report. I wasn't able to find anything on her (specifically) in newspaper archives, but I did come across another posting that indicated she went to Moxee High School (East Valley) (Class of 1975), last known residence in Yakima, lived a high risk lifestyle, and may have been in the Seattle area when last seen. Given the missing report date of 2004, it may have been as a result of LE call out for missing women from the area who could be victims.
Has anyone confirmed her height by chance? 5'10 is definitely above average ht of female.