That might work...has adjustable legs to accommodate for her sloped floor. Might be a bit of a job getting the frame over the roost. Unless @RoyalChick is a decent sewer...then she could put velcro or other tabs on each corner and hang the canopy cover without the awkward framing..... Love the flap for the back, that is EXACTLY what I was thinking with the sheet.What about a portable gazebo thingy....
Kinda like this
https://www.walmart.com/ip/Topbuy-7...utdoor-Offset-Tent-w-Carry-Bag-Blue/799008831
That said, her idea of an umbrella would probably work really well....a rain umbrella (larger one) that is smaller than those big patio umbrellas, and tend to be a bit more curved.....as long as the handle doesn't get in the way.