I think Winifred is in the Nathaniel Rich lot with the wrought iron fence around it in Oak Hill Cemetery in Winterport. I may be remembering incorrectly, but that's what comes to mind. I'll try to remember to check when I'm in Winterport in June.
If you're in touch with James' daughters, you can give them my email address in case they're interested. email@example.com
We could be neighbors - who knows?