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Nancy does look very much like Jane Doe. But there are several inconsistencies:
First of all, Nancy's front teeth don't appear to be crowded, as Jane Doe's are (though the photos aren't very clear).
Secondly, Nancy has no apparent connection to Europe. The UID has dental work that was most likely done in Europe. And it would be quite a long-shot to think that perhaps she traveled to Europe during the seven years that she was missing and then returned here to be escorted into the Sierra Nevada woods and executed.
Thirdly, although they mention the vaccination scar on her arm and the surgical scar on the abdomen, there is no mention of scars on the wrist. But it's possible that they were too small to mention.
And finally, the Jane Doe was (5'5" to 5'6"), whereas Nancy was on the small side (5'2" to 5'3"). But I've seen 3 and 4 inch height differences before between UID's and the MP's that they are subsequently matched up to.
By themselves, any one of these negatives by themselves probably wouldn't be insurmountable. But as they stack-up, they become harder to explain away.