I think you could try to reduce her bedtime gradually as Fionas suggested. DS crashes between 6.30pm and 7.00pm every night and I love my time at night to do what I couldn't get done in a day.

Perhaps have the last BF, cuddles and then let her know that you are leaving but that you'll be back in 5 mins to check on her. I would attend to her straight away if she's upset, but if she is just calmly lying on her bed with her elephant then I think that is fine. I know sitting with her doesn't bother you but I wouldn't want to get her into the routine of taking 2 hours to wind down regardless of the time she is actually going to bed.

HTH
Spring