I agree with the PP, every baby is different and you cannot predict how much formula your lo will acutally take.
I would first try the faster flow nipple and see how you get on. If you find that she is taking more that is fine, and then from there you can judge how much to offer your lo. At this stage your lo is still learning how to take from the bottle, so give it a bit of time, and I am sure she will soon up her intake.
Good luck.
Paula