OK Peggy, so a burglar opened the shutters then fled.
Yes, and the exact simple reason is: he thought he had established no-one was home (only one table lamp on, no noise at window or door, no reply to precautionary knock at door) however as he proceeded to gain entry the shutter noise woke a sleeping occupant and he saw this just before climbing in, and shocked to find someone home, he fled. Entire paragraph IMO.
scaring Maddie in the process
Just as someone figured out the first moments of the missing plane mystery by the novel approach of putting himself in the boots of the pilot, I imagine I am the occupant asleep in that room. I get awoken by a loud noise of shutters and see a figure outside the opened window/shutter. Yes I would be out of there and into another room. Entire paragraph IMO.
she falls off the back of the sofa
Not sure there is enough evidence etc to be anywhere near definite about that. Looking at other child-home-alone-during-attempted-burglary cases the child generally hides, for example in a cupboard. If you think it was near the sofa I would think hiding behind more likely than falling off but I don't know. Entire paragraph IMO.
Who moves her body?
You are jumping far ahead. I prefer to go more slowly. What time period are you asking about? Entire paragraph IMO.
(Edited to add "IMO"s)