Is she already flowering??? I hope not

like Bloombuster already said, it's not the preflowers, but those are the regular internodes, where new branches will appear.. eventually this is where you'll see the pre-flowering signs from calyxes and pistils, but - despite her being a fast F1 strain - it's a bit too early to show the sex.. and after all the fast-F1's are photoperiods, not autoflowers, so even if she would have shown her maturity by showing the white pistils, she would not have started flowering yet.. that's only triggered by putting her into 12/12, so don't worry