The training montage, where Bruce handily outperforms her when he decides to make an actual effort, so you clearly didn't watch the episode, of you're making shit up again. He flicked a rock a short distance, she hurls one further, he fires a third into orbit, proving exactly this.
She can turn back and forth because she's
mentally healthy. There's no inner dissociative personality conflict. 99.9% of people, if they could survive being made into a Hulk, would be in the same boat as Jen. It has absolutely fuck-all to do with "being a woman" and I have no idea where you're pulling that garbage from, because it sure isn't the show.
Yeah, she's not mentally unwell, like her cousin is. And? That's not a statement on gender. That's a statement on how unhealthy Bruce was and the effort he's needed to invest just to reach a relative state of "normal". Again, this is all
explicitly stated in the show, not just implied, and you've got to lie about it to push your agenda.