I have no idea either. I have 'V' and U5a on different sides of my family. Both are from SE Alabama farming families.
There are some interesting/inputs ideas on this thread:
Before The Fall Of The Reindeer People
The last post on that thread is by FReeper Viiksitimali , a Sami.
Someone said that some Sami landed in the New World as slaves to work in the timber industry.
>> Someone said that some Sami landed in the New World as slaves to work in the timber industry <<
Many Finns carry Saami mtDNA. Moreover, my understanding is that maybe half of the settlers at Delaware’s “New Sweden” colony during the 1600’s were actually of Finnish ethnicity. The Finns of the colony did a lot of manual labor and other low-prestige work, whereas the ethnic Swedes were more likely to be aristocrats and property owners.
Therefore, if your mother’s maternal line could be traced back from Alabama to Delaware, NE Maryland, SE Pennsylvania or southern New Jersey, maybe somebody like her GGGGGG-grandmother was a settler at New Sweden.