Tanks for all your replies. She gets very excited budgie sounds for her; she bobs her head and joins in. I try to make noises too (I'm sure if anyone heard me I'd be locked up). She likes toys with bells but prefers colourful plastic ones to wooden ones - she tends to ignore them but I'm hoping she'll take to them one day. I've noticed that she likes to spend most of her time at the end of the cage closest to me which I've taken as being encouraging.
She refuses to try fruit and veg but I'll persevere with that and hopefully one day she'll start taking it. I'm really pleased as tonight she nibbled a little millet from my fingers.
I'm really keen to get a friend for her but it's not possible at the moment as I'm due to move house shortly and want to be settled before introducing a playmate