Yes, I think she unfortunately probably was rejected by her family which is why nobody has come forward. But the DNA Doe Project post specifies that there's a possibility she wasn't raised by her biological family. Since they're doing genetic genealogy on her, that makes me think they suspect that one of the reasons they're hitting roadblocks is that she's adopted etc. Like if they found a second cousin and looked into all of their family but didn't find any possibilities, then it's possible that Julie was adopted out of the family or that the connection might not be one that was on paper. Like if the second cousin's cousin was Julie's father but her mother had an affair, so he's not the father on paper and thus the biological connection wouldn't help and Julie wouldn't appear in any records for the cousin's family.