Your cat is young so the chances are she won't have gone far from the place she knows.
I'd search round your place and keep searching especially at night when you might have a better chance of hearing a response. Are there any other cats living nearby ? If she ran into one she might have hidden somewhere to avoid a fight. Check under all cars and especially gardens, ledges, tops of sheds etc.
I understand how you feel, our late cat once went missing for over two weeks. She needed hospitalizing for multiple injuries but she did come back, to our immense joy.