In 2016, I submitted Dorothy Arnold to NamUs for a potential match to the adult set of unidentified remains. Since she didn't have an active missing person report, which is needed for NamUs to get involved, they wouldn't investigate it. However, the caseworker said she forwarded the information on to Vermont investigators to see if they thought it would be worth looking into, based on the circumstances. I never heard back from anyone about it, but unless they found a living female relative of Dorothy's for a DNA sample, there would be no way to compare them.
After reading how expensive the dental work would have been back then, I think it would bear looking into, if they haven't already. Dorothy came from a very wealthy family & would have had high standards for something like that, and may have had access to money no one knew about.
And 11 pages later and a refresh on Dorothy I think she just left and could very possibly be the 1935 Jane Doe. I think there was a phone call or a visit after she went “missing”. Could she have blackmailed her father to continue her source of funds for the next 20+ years. About a pregnancy coverup or filing false missing reports etc. I'm sure she had lots on the family. Those funds could have paid for the older child’s orthodontics. Were the funds running low in 1930-1935 and Daddy was done paying. I believe that’s Depression time. Further research into George, Dad an Mom Arnold, the business etc.