It's possible, for females to learn to mimic some sounds and even human speech but you should be aware that even though budgies in general have this potential for mimicry, not all will effectively develop it or have the talent to do so. And this is true even for the male budgies and this is regardless of the amount of time spent in training.
I currently have 2 males who are talkers, one of them is leaps and bounds more talented and is constantly talking (saying words and singing in his native budgie language), he is able to make all of my lovebird's chirps and has even learnt how to bark like a dog. I never made a conscientious effort to teach him to talk as the words came naturally and almost effortlessly to him. My other talker, I started training sessions with him when he was 3 - 4 months old and while he has learnt a few words, I notice he is not so sharp nor interested in learning and using his words on a consistent manner.
I have a couple of females who only mimic certain sounds (easy ones) and calls from sparrows outside.
I currently have 2 males who are talkers, one of them is leaps and bounds more talented and is constantly talking (saying words and singing in his native budgie language), he is able to make all of my lovebird's chirps and has even learnt how to bark like a dog. I never made a conscientious effort to teach him to talk as the words came naturally and almost effortlessly to him. My other talker, I started training sessions with him when he was 3 - 4 months old and while he has learnt a few words, I notice he is not so sharp nor interested in learning and using his words on a consistent manner.
I have a couple of females who only mimic certain sounds (easy ones) and calls from sparrows outside.