Sometimes trawling the depths of Youtube can really pay off. I found an excellent interview with Sridevi on Doordarshan's Baaje Payal from 1994 which focuses on her dancing. The interview is replete with clips and commentary from costars and choreographers (including Saroj Khan) commenting on the energy and emotion she put into her dancing. There's also a fairly in-depth discussion about the animosity between Sridevi and Madhuri Dixit. The interview is split between Hindi and English so it's easy enough to follow, and even if it weren't it's worth it for the film clips alone!