Broody and eggs - Day 18

Hello everyone, this is my first post.  We have owned back-garden chickens for four years now and this summer decided to take the next step.  Our Light Sussex hen became very broody in July and we decided to order half a dozen Crested Cream Legbar eggs for her to sit on.  She has been splendid so far, taking the job so seriously that we have to take her off the nest in the late afternoon to eat, drink and do the necessaries.  We wanted to keep her with the other three girls for as long as possible, but plan to put her and her eggs into the ground-level coop and run this evening.  Does anyone have any advice on the best way to go about this?  Our other question is regarding the flooring of the ark she is moving into.  It is an Eglu Go, with built in ground level perch and nesting area, which is removable.  Do you think it would be better to remove this, leaving Diana lower down to the ground with a flat area for the chicks to move about in, or to cover the perching area with cardboard and wood shavings? 

I know I sound a bit over-anxious, but the closer it comes, the more I feel like an anxious new mum myself?  Any advice would be very appreciated.

Thank you Sassy.  We took your advice and moved her yesterday and all went well and she has now snuggled down on her eggs in her new home.  Luckily, she has got used to being picked up each evening when we put her in the run to eat and drink, and has become tamer over the last couple of weeks. We have removed the perching bars and sprinkled medium wood shavings on the floor.  We're keeping our fingers crossed and will keep you posted as to what happens when the eggs are due to hatch on Tuesday.