Totally normal, as Sailboat, our resident comedian, has already said, lol. It's not uncommon at all for birds to be able to "fly" after a wing clipping, sometimes directly after a wing clipping, although directly after a clipping they shouldn't be able to get much elevation at all, but they can glide forward and down quite well. Bella just has enough new growth since her clipping to be able to elevate.
I always judged when my mom's African Grey needed clipped again by whether or not she could elevate, once she could fly up the stairs or prop herself on the ceiling fan on our 14 foot living room ceiling, it was time for a clip. So if you're planning on keeping her clipped she's probably close to due, if you're planning on letting her wings grow in and keeping her flighted then she's almost there. My mom always used to keep her CAG clipped back in the 80's and 90's before she had a harness because she takes him everywhere with her. Now he is fully flighted because he's on a harness. It's a personal choice and no one else's business in my opinion, some people need to have their bird's wings clipped for safety reasons, or because there is a good chance their bird may fly away for whatever reason. Either way it's a person's own choice, not to be judged.
I know this should be a "relative to size" thing but in my own experience it's not; I grew up with my mom's CAG and I have volunteered at an exotics rescue that has lots of large parrots, and since then I myself have only owned smaller birds like Conures, a Senegal, a Quaker, Cockatiels, Budgies, etc. And for some reason it seems to me that larger birds that have their outer primary flight feathers clipped can fly much better (higher, farther, and get more gliding distance) than smaller birds with the same clip. Maybe it's because larger birds have much larger wings or more wing surface area, I know it should be relative and proportional, but in my experience it has just been like that. Smaller birds who have a proper clip of their primary flight feathers only glide right down to the floor after a clip, while my mom's CAG and the macaws, greys, etc. at the rescue seem to still get some air and some distance right after the same clip...I don't know, maybe I'm imagining things
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