Are u sure thats an auto..
I don't think it is buddy.
But, if she doesn't flip by day 40 then she'll be a fem. You can wait till then. Or either block out bud from light and if she starts to throw off pistils and the rest doesn't, then she's a fem. Anyways.
She, is a bit small. But, not much you c do. Fems can take a lot longer to grow as some might not have ruderails in it, so they take longer to grow..
Good luck.