Can mtDNA give clues to Sarah Stolebarger's identity?

I have long wondered about who my 3rd great grandmother Sarah Stolebarger really was. Sarah was born about 1802 and by 1823 she was married to John Stolebarger and living in Union, Huntingdon County, PA. Her maiden name, country of origin and date of birth are all unknown.  I wrote about the details of my genealogical research here.

My mother's male first cousin is a direct maternal line descendant of Sarah, so I decided to test his mtDNA to see if I might get lucky and find something meaningful. Since mtDNA is not often helpful for genealogy, I know that this is a long shot.

Yesterday, I received the HRV1 results:

Haplogroup I 

HVR1 differences from CRS:
16093C
16129A
16218T
16223T
16263C
16391A
16519C

I don't have any experience with mtDNA Haplogroup I, so I have been doing some research. According to Wikipedia, it is quite rare and found in low levels throughout Europe, the Middle East and South Asia. Reviewing the mtDNA I Haplogroup Project, I did not find any matches.

According to FTDNA, there is one exact match (HRV1). I contacted her and learned that she is also researching a Sarah (maiden name unknown) from the same area and time period as my Sarah. We both suspect that our Sarahs were of German ancestry, but have no documentation of their origins or parentage. Hopefully, this match will bear fruit in the future, but for now both genealogical brickwalls stand.

I am still waiting for the HRV2 results, but I don't expect to have any new matches at this time since there must be an unusual mutation in HRV1. It will be interesting to see if I can learn anything more specific about Sarah's possible origin when/if a subclade is assigned.

[Disclosure - My company StudioINTV has an existing production agreement with FTDNA that has no bearing on the opinions I express. I also receive a small commission from FTDNA on non-sale orders through my affiliate link, which I use to fund DNA tests. I receive no other compensation in relation to any of the companies or products referenced in my blog.]