I would think Petunia would actually dislike fem!Harry even more. Harry at least only has the eyes that remind her of her sister; a female would obviously look a lot more like Lily, possibly to the same extent that James and Harry shared looks in canon. Petunia would probably be just as strict, although I can't really see Dudley smacking her with his Smelting's stick or Vernon punishing her quite as harshly -- it would be a lot more quiet on Privet Drive in general. It would, however, make for an interesting twist to see Petunia raise her more like her daughter, perhaps spoiling her in the same way she did Dudley. "For your birthday, you get one more present each year!" You could even take the dramatic angle and have her hide the truth about Lily and James' death up until the point that someone comes to get her for Hogwarts, causing a falling out between Petunia and fem!Harry (who has been corrupted into a mini!Petunia with the pursed lips to boot). I could see that sort of character's personality falling somewhere between Hermione and Parvati -- the desire to improve ones self coupled with the material girl aspect -- with real world events slowly shaping her into a heroine with time. So a spoiled, angry, fem!Harry does not like the look of the unkempt and loud Weasley's and thus ends up on the train alone until Neville comes back to ask her about a missing toad (to which she is sickened by the thought that the boy carries a toad around with him), Malfoy comes to find the Girl Who Lived (and while he looks well-to-do, he's so boorish she easily ignores him) and Hermione informs her that it is time to get changed (to which she informs her she will change when she's ready, and only then). There's some merit in this... probably as a lulzy one shot, but still.