It was the same with my daughter... we tried every cup, every spout... finally , when she was 13 months, I gave up and she continued to take a bottle. In a couple of weeks I saw her to sit up right and try to level her bottle to drink from it. So, I knew, she finally got the idea. I bought a sippy cup next day and she used it since. The brand doesn't matter... so, maybe, you'll wait a little bit, she'll definitely grasp the idea pretty soon. Meanwhile, keep showing her how to drink from the cup - so she sees you drinking and try with her from time to time. But as far as it works with my daughter with everything, they just figure out everything by themselves at their own time.
Just read other responses, and yes,I remembered, she used the sippy with the straw before. They're easier to use because the kids don't to have to elevate them, but actually don't teach the idea of drinking from a cup. Maybe, start with that sippy - it's also good if she learns to drink through the straw.