OK thanks - I don't have wild bird seed, but I'll get some today.  Could all the nuts be why she's got runny poo?  Her water dish, by chance, is quite deep - certainly deeper than her bill, but I'll get a deeper one in there just in case.  I've opened the door of the cage and she's having a wander around the spare room, but I won't let her outside.  thanks for the advice!