My infant is making oooh and aaah sounds. Does this mean that she is trying to speak?

Yes. This is your baby's way of communicating and usually occurs around 1-2 months of age. Your baby may also communicate by smiling, laughing or crying.
Yes. Your baby is starting to communicate vocally and is "discovering" her/his own voice. Ooh and aah sounds are usually the first vocalizations (other than crying). You will notice your baby starting to communicate with you by studying your face, watching the movements of your eyes and mouth. This encourages him/her to continue vocalizing and socializing.