this may cause due to urnie infection consult skin specialist
Looks like she is suffering from what is called alopecia areata. Its patchy circular hair loss from scalp and any other hairy part of the body as well like eyebrows, eyelashes, arms, legs etc. it can start suddenly and become extensive or get ok on its own also. its an autoimmune problem. Check for other health issues also like anemia, thyroid disorders, any infections preceding esp viral, etc. It does have stress and undernourishment as commonly present.