Well,
That's undeniable. Emma Silverfox is part of the original timeline continuity. Timeline Prime = Earth-10005.
As simple as that, following the model of the Occam's Razor:
1- She's named Emma after her mother.
2- She's blonde like her biological mother.
3- She's white (Caucasian), while Kayla Silverfox (her adoptive sister) is Native American.
4- She can turn into living diamond.
5- There's a relative in the team of scientists backing up 'Weapon X': Carol Frost.
She is Emma Frost's daughter. And the "future" White Queen, since Emma Frost has been killed by Project WideAwake before 1973.
On the other hand, the "Quicksilver" and "Banshee" kids in X-Men Origins are two mutants who has been experimented upon, inserting respective Maximoff and Cassidy DNAs into their genome. Stryker and his team were refining the same technique used to create Weapon XI/The Dead Pool.
The timeline:
1963: The Brotherhood of Mutants is formed (Magneto, Mystique, White Queen, Azazel, Riptide).
1965: Emma Frost's daughter, Emma Jr., is born.
1967: Magneto and White Queen are captured.
1983: The events of X-Men Origins: Wolverine.