So her room has been a tip, basically since New Year. She has had friends up a few times and they pull everything out and tidying up means shoving everything to the side to make a 'fire path'. However I have spent most of yesterday and today totally sorting every single thing into various containers - Barbie-type dolls, bouncy balls, dolls house furniture, vehicles etc all in their own boxes. Still have a huge pile of unsorted stuff but now but now have places it can go. Now, I just need to keep motivated for a couple of nights this week and it should be done
Have also managed to get rid of a big bag of stuff sneakily and have a big tub for selling! It is in the 'worse before it gets better' phase but I would recommend this to anyone with a tip of a child's room - I feel so much better - now just the rest of the house to go 
Basically just posting this to share my joy!!