Oh i see, meaning that her father could have adopted her?
More often, misattributed paternity is a result of affairs between the mother and someone else. Adoption is one reason for NPEs, but it's not the most common. Donor conception (because of an infertile parent) adoption, affairs, the mother simply thinking the wrong man is the father... There are thousands and thousands of people who have taken DNA tests (with Ancestry, 23andme, etc) and found that the father on their birth certificate is not their biological father (or sometimes, both parents). And this could be the case for any of the Does, the Does parents etc... or their relatives in the GEDmatch system.
For me, if I were to match one of the Does on GEDmatch, I might confuse DDP. Legally, on every system and legal document, my dad is my dad. But he's not my biological father, because I was donor conceived, and wasn't told. So my family trees were made before I found out, and they show my dad as my dad. So if I were to paternally match one of the Does, DDP might start looking into my dad's family... when really they would have to look at my donor's family. That's why NPEs might make DDPs work harder.
Adding to that, there are plenty of men who have kids they don't know about, out there. So if this high match is a half first cousin, for example... let's say the Doe's half uncle has a child out there he never knew about, and that's the match. It might be hard for DDP to untangle the web, because the match will have a different father on their birth certificate and won't have any tangible connections to the Doe.
Of course, there's a good chance there's no NPEs in the mix, but it does happen!
