That is called "preening". She is cleaning and waterproofing the duckling's feathers with oil and removing old feathers and down.
In the wild ducks do not take shelter. In husbandry ducks are kept in a "duck house".
Ducks have a relatively thin skin covered with feathers. Since ducks are aquatic, they have preen glands with oil on the base of their tail; this oil is spread on the feathers to keep the duck dry while floating on the water.
a duckling
it is a seed that the daddy duck plants in a mommy duck to make a baby duck
Curled tail feathers on a duck are called "drake feathers" and are found on male ducks, known as drakes. These feathers often curl upwards and are used in displays during courtship to attract females. The curled shape helps differentiate male ducks from females.
Baby swans, called cygnets, are typically larger and have longer necks than baby ducks. They also have gray or brown feathers, while baby ducks have yellow or brown feathers. In terms of behavior, cygnets are usually more independent and can swim and feed themselves shortly after hatching, while baby ducks often rely on their parents for care and protection.
When a duck is a baby, it is called a duckling.
Ducks , geese , and pelicans
Ducks that have puffs of feathers on their heads are various types of domestic ducks called "crested" ducks.
The baby duck is called a duckling or ducklings.
Baby ducks are ducklings.
A female duck is called a duck, or, as a female bird, a hen.