Hi There! As an SLT I would recommend seeing an SLT for a look see! It's probably nothing to be too concerned about, as kids all develop at different rates and the fact she is babbling is a good thing. In saying that, seeing an SLT will be valuable in that they can suggest things to encourage speech and language development.
There are lots of ways to encourage speech
Kids learn by example, so narrate your daily outings and routines. It's important to use the word frequently. eg when you are driving in the car and you stop at a red light. "look at that RED light. We've stopped at the RED light! When will the RED light change? What else is RED? Oo, that car is RED, and that rood is RED and that ladies jumper is RED etc etc"
Also, book reading is a fantastic way of talking about things and encouraging naming.
Additionally, turn off the TV. Studies have recommended that children under the age of 2 should not be exposed to ANY TV (ever wonder why Disney's Baby Einstein put forward a formal statement that their program doesn't make your baby clever, and in fact may be detrimental to their learning!!!)
There are so many things to do to help, and your SLT should cover them.
Just remember that you are the best person to implement techniques because you can do them all day every day!
Also, eliminate Autism from your mind, until MANY more factors become apparent. Bring this up with your SLT and don't stress about it.
Good luck and I'm sure some great speech is just around the corner!!!! smile