I do not think she is a vanilla at all. She does not have the blushed head like vanillas have. Personally I think it is only a pastel.
Here is a picture of my vanilla, see the blushed head. All the pastel vanillas I have seen also have the blushed head and are usually more bright of a yellow. I really doubt that it is a vanilla at all and is only a pastel.
I too agree that it doesn't appear to be Vanilla. Here are two Vanilla girls of mine from different breeders and you can see the head blushing. Also the one in the picture you posted looks to be browning out like a Pastel.
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I would pass as it doesn't appear to be the morph the Seller is saying it is. Too me, any morph worth adding to my group should leave me with no doubt as to it's genetics. That's just my $0.02.