You just let her try and she will get the hang of it. Plenty of people jsut go straight to open cups without ever using sippy cups. My 11 month old can use an open cup with help. He gets a little soggy but he gets just a soggy with a sippy cup!
My dd is nearly 17 months old. She has been happily using a sippy cup since she was 6 months old. She's also got a couple of the beakers (same as sippy cups but without the handles). She has also recent started to drink from a sports bottle top but I was wondering when I should be trying to get her to drink from an open top cup without the safety net of the no spill lid? How do I go about it without water going everywhere?