I put music on my belly for my lil guy, smooth jazz, and when my babies were young I'd have shapes and words written out and they learned very quickly. Talking to your baby is gud too. Reading as well.
You can read to her since she does hear your voice, and some people like to put classical music to their stomachs while pregnant. I'm not sure how it helps really, I think the best thing to do is start teaching her things the moment she can understand them and talk. For example, when my daughter started talking, I started teaching her her shapes and colors. She's 4 now, and already reading and writing thanks to giving her early starts on things.