Like it or not, VS loves Alexina, so does Ed & co. She has the energy and enthusiasm that VS wants, and on the sex appeal side, Alexina is decent enough.
Legit, that's how a VS model should probably be like. You're promoting lingerie, you need to be fun and sexy, maybe mysterious. Alexina has ticked all 3 stuffs off the box, and I can see why VS loves her. Minus her weird accent, and I think it's just her being nasal and she's got some pretty weird quirks going around.
Also, Alexina has the advantage of being a redhead. She's just a rare beauty because of that ginger hair.