She is not an Angel. They released an Angel line-up for this year's VSFS and she is not on it.I think the reason she was in the credits last year is because she was in the commercial. It's not teh frist time they did that.
As you can see up here, it's not the first time they did it. The "regular Angels" have a extra set for their credits, whereas Lindsay, Candice, Rosie (in the commercial), Behati (PINK Girl) and Erin (IDK, they don't even have the right initial for her, it's an R, so I'm gonna say it's a goof and they wanted Chanel, who was in the commercial, instead or something) have runway clips. Likewise last year, the Angels had a photoshoot with fake wind and Lais didn't.
http://www.youtube.com/watch?v=t0hArGa-7W8
And in 2005 there were some backstage clips of the "new Angels" (- Tyra, + Selita and Izabel who were in the commercial as well) alternating with the "old" ones (+ Tyra, - Selita and Izabel)'s "real" credit.
I'm thinking that in the "hierarchy of VS models" she's a pretty high catalogue/beauty/commercial regular but not a spokesperson like the PINK Girls or the Angels.