Yep, that whole (rather dull) just sitting there process is definitely the beginning. Encourage it whenever she asks, and maybe start to suggest it at times she regularly needs to go, i.e first thing in the morning, right before bed or bath, just after meals etc. When she finally does actually use the toilet, make a big fuss over it and you'll be on your way. Being nappy free whenever possible at home (and easy in summer) really helps too.