I've been following this a lot, because I'm starting to worry about Isadora some. Her previous owners stated they had only recently clipped her, but when I compare her to what Pudge was like... Pudge fluttered all the time. He would take off from one room to another, despite not being able to fly. She doesn't even attempt to. She's gotten startled twice and there were a few flaps but she doesn't really make a lot of flight effort...
Did they say whether she flew regularly before they clipped her?
Boo came to me with flight feathers intact. Her previous owner didn't "need"* to clip because after 11 years of not being able to trust her wings, she never even tried to fly. She had long ago given up flapping except in a panicky way to break a fall. Her wings may as well have been glued to her sides. Having her sit on your hand and raising and lowering it? She wouldn't spread them an inch. The most she would extend them was a bit out from her sides on rare occasions when she bathed in her water bowl. (She gets offered regular showers, and she likes hanging out in the bathroom, but she rarely actually chooses to get wet).
I strongly suspect that, despite her clean bill of health from the vet regarding arthritis or other serious issues, the severe muscle atrophy made it actively uncomfortable to spread her wings, let alone flap.
One of our greatest triumphs with her is that she now raises her wings on command (eeaaaagle). It took 3 years to get her to that point.
My next goal is teaching her how to turn. Currently she only flies in straight lines. I'm still puzzling over how to set up her stand to start encouraging her to curve her path a bit without making it so difficult she won't attempt it. (The layout of my house is such that there just aren't many turns).
*Need is the wrong word, but you know what I mean.