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I'm guessing this one is a photo. Could be one of two things, as I said before, some breeders don't carry breeding quite far enough to lock the auto gene before sending to market, in this case, it will be somewhere between auto and photo, some are sold thus way as "fast photos". Still require a lighting change to get to flower.
Or... also possible, a random photo seed made it into the mix.
For 66 days, she looks a little small, but healthy. I dropped seeds on the 3 of October (sour starburst) 10th (3 mephisto strains) and the 15th (3 of my own crosses). The first 3 will be cut in a week, maybe a bit more, and the others spaced accordingly. All are well into flower. If I had this come up, & I had other autos going, I'd think of up potting the photo, finish the auto on auto lighting, then flip the lights and flower her. Hopefully she'll gain some size and fill a good portion of your space.