A Mother Hen is a person, especially a woman, who is overly protective and attentive to the needs of others. The term also refers to a hen with chicks, which she protects and cares for. 

For example:

She always worries about me, like a mother hen.

The coach fusses over his players like a mother hen.

The old woman guarded the children like a mother hen. 

He’s a good guy, but a bit of a mother hen when it comes to his girlfriend.

Tradução: mãezona, chefona.