The issue is that yes, most sealants contain BPA...but most composite fillings contain BPA also.
So if you seal the teeth, you will be exposing her to BPA. If you don't seal the teeth, and cavities develop, you will be exposing her to BPA when the tooth is filled anyway.
I would most likely opt for sealants for a child with a history of dental problems and deeply grooved molars. But for a child with strong teeth that are not prone to cavities, I would...