B.R.
It's still not too late to start baby sign language! A lot of babies will pick up on the fact that they can't say the words correctly, and many just won't say them at all (very like her preference for crawling, which she's good at, versus walking, which she hasn't yet perfected).
Signing provides them with an alternate way of getting their point across, and it also helps them build enough confidence to start speaking. There are lots of great books available, but I'd just start with an ASL website, like this one: http://www.aslpro.com/ It provides videos, so you can actually see how to do the sign. And they even have a dictionary specifically for baby sign.
Start with the words you want her to speak: milk, eat, play, whatever they happen to be. Then just use the sign EVERY SINGLE TIME you say that word; consistency is key. Before you know it, she'll be signing, and then, talking.