Thanks for your detailed reply, there's some really great advice there. Just to clarify, Holly isn't barking at or being aggressive with other dogs. It's more at home around us that she seems to be very possessive over toys etc. and will bark or growl if she isn't getting constant attention.
Her barking at night is really one of the biggest problems and just seems to have developed recently.
If I understand your reply correctly sounds like we need to work harder with some of the recommended training techniques to re-establish our relationship with her so she knows her place in the family, then these behavioural issues should be possible to manage. Is this correct?
Many thanks for your help so far