Mark, project protection requires the profile meet all of the following criteria:
1. They must fit within a project. The Native Americans project could protect her as an "adjunct" since she married into a tribe and considered herself Indian.
2. They must be 200 or notable. She was born over 200 years ago, so she meets that. She has a wikipedia page, so she also meets criteria for Notable.
3. They must have the lowest numbered ID. I don't believe she has any duplicates NOW, so this is met.
4. They must be controversial or duplicated. More specifically, the help page says: "frequently-duplicated, subject to confusion, etc. There must be some sort of controversy or duplication problem, or reasonable expectation that there will be." Unfortunately, I don't think she meets this fourth criteria, which is probably why Gillian did not replace PPP after merging a duplicate a few years back. Yes, there was a duplicate but no evidence of ongoing duplication problems.
If there is some evidence of controversy, the Native Americans project would be happy to protect her.