I keep thinking about those tests (I forget what they are called) which showed that she grew up in a specific part of Texas.
With those in mind, I think one of these scenarios applies to Smurfette.
1) She is a girl who has not been reported missing.
2) She has been reported missing but hasn't been compared because she doesn't fit the vital statistics.
3) She went missing at a young age and ended up in that part of Texas.
4) She went missing from a different part of the US, but she had lived in Texas until very recently
Personally, I'm leaning towards no 1, although I am patiently waiting for Tina Velasco's NAMUS DNA status to move to 'tests complete' to see whether no 2 might be right...