That could be Mama. Nests are not the safest place for fledglings, so mom or dad will push them out of the nest, but they are not abandoned. (Predators can find a nest easier than an able-bodied fledgling).
I once rescued a baby chickadee from a neighborhood cat that was stalking it. The parents were going nuts in the tree above, so i set the little bugger in a yew bush and took the cat away and gave it treats. Everyone was happy that day
Excuse me, but it’s pronounced GIF