Some babies actually never drink from a bottle. Nursing babies, for instance will often, when being fed with pumped milk, drink that milk from a special cup because some don't take well to the difference between the natural and the artificial nipple.
Bottles are designed to make feeding children easier, and are not a necessary aid toward development. Unless she's not getting the yummy stuff in her body, It's not a problem.
Just keep in mind, bottles are convenient for travel, and for keeping the home clean. Sippy cups aid in that too, so as long as that's the type of cup you're brilliant little girl is drinking from, I say, no problem!
My unprofessional, possibly totally wrong opinion. :p