How is she doing?
I agree that it is a whiptail, but it is not so easy to determine the species from this photo.
New Mexico whiptail (Aspidoscelis neomexicanus) is possible. If it is this species, the species is female-only (according to wikipedia), and so this would be a girl.
Looking through other whiptails found in New Mexico (is that where you found her?), I have found photos of the Texas spotted whiptail (Aspidoscelis gularis) that with patterns of spots similar to the lizard in your picture, so that is another possibility. If it is the Texas spotted whiptail, I do think that it is a female as well because the males have more color (red throat, blue belly).