OK, I am no expert, but, she doesn't look like a female VT to me... she looks like a female HM. I say that because the female VT's I have seen have more oval tail fins. The HMPK's I have and HM's have the nice rounded tail fin like she has.
Examples:
Female Veiltail- see how it kind of points at the end? Not the best pic since she is swimming but you get the idea...
Female halfmoon- no point, just a nice rounded tail.
UNLESS she is not HM because of branching, because i know nothing of branching... :D Or i could just be wrong...