Wondering about tips for potty training a girl?

DD is 4 in January and absolutely refuses to use the toilet, regardless of it being a trainer potty , cover lid, or regular. She knows when she needs to poo/pee and communicates it but absolutely refuses to use the toilet. Even if she's naked, in her bottoms or pull up. I feel she is way too big and knows her cues and what she needs to do so I don't understand why she is refusing to use it. My son was so much easier to potty train and I feel useless I thought it'd be easier potty training a girl.