Learning to fly does have its hazards, and the fledgling was doing quite well at taking off and flying but much less well at landings. She must have run into something trying to land because she broke her furcula. (Technically this is the wishbone, the flexible fused collarbones in birds.)  Her wing bones are intact, but she is not using her right wing and cannot fly.   

 

A look at this picture should convince anyone who may doubt it that animals have emotions much the same as ours. Even through the feathers, there is ineffable sadness in her expression.  She slept a lot, refusing to eat much of anything the day it happened.  I worried.  I spoke sweetly and regretfully to her. (Tone is understood between species.)

 

An experienced bird person and I put a length of vet flex over her right wing, under her left wing, and around her body to secure her wing in place. After her first day of moping and sleeping, she had recovered her wits enough to press for her biological imperative to learn how to fly. (In her case, learn how to land.) This phase of growth for birds is akin to toddlerhood and adolescence combined.

She kept the binding in place for four days. With me holding her head and legs and turning her like a tiny rotisserie, Daughter was able to rewrap her right wing. The fledgling had that off in four minutes flat.

This is the reason that many birds will hatch out three or more clutches of eggs a season. There is a high mortality rate in nature for young of all kinds. Baby anything is at risk. I remember quite well the pregnant rabbit when my child was ten and how it turned into "The Summer the Children Learned about Death". This may end badly.