NOT the cheapy walmart variety--not worth it--the valve fell off when the cup fell/dropped and the top was hard to use.
Try a few different type to see what she takes to. We own a dozen of the hard top Gerber ones in both sizes for my 2 lil's b/c I love them--they leak the least. The first kid didn't like them at first and we used the ones w/ silicone spouts, but then grew into the Gerber ones. She stuck her fingers in the silicone spouts and make them too leaky for my standards so we were forced to change. The 2nd kid took to the Gerber ones right away. Each kid will have their preferences.
We also removed the inside valves at first b/c they were sooo hard to suck for a beginner sippy user. Once she got the hang of it, we started using them again to make it leak-proof.