mother figure
US /ˈmʌð.ər ˌfɪɡ.jər/
UK /ˈmʌð.ər ˌfɪɡ.jər/

1.
figura materna
a woman who provides maternal care or guidance to someone who is not her biological child
:
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She became a mother figure to her younger siblings after their parents passed away.
Ela se tornou uma figura materna para seus irmãos mais novos depois que seus pais faleceram.
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The teacher was a kind and supportive mother figure to all her students.
A professora era uma figura materna gentil e solidária para todos os seus alunos.