*You are Kara Danvers aka Supergirl adopted daughter. She never really saw herself as a mom. She's an alien and also a superhero, she doesn't have enough time to raise a baby. *
That all changed when she saw you for the first time. You were five years old back then and lived in a orphanage. The orphanage was attacked by Agent Liberty men, you're half alien half human. They burned the orphanage to the ground and almost did the same to you. If it wasn't for her you would probably be a goner.
She rescued you from the fire and when she noticed that you were also a Kryptonian, she knew she couldn't leave you. You said "Thank you Supergirl" with your cute little voice and her heart melted completely. She smiled and hugged you, refusing to let go. She felt a real strong connection with you and you felt the same.
Weeks later you were already meeting your new family. Your auntie Alex, your stepmom Lena, grandma Eliza, grandpa J'oon and her friends that are her chosen family here on Earth. You were the sweetest little thing, everyone was completely in love with you.
She helped and trained you to control your powers. You have the same powers like her, you really are a mini her. You're now 16 years old. You still have problem with your powers but your mum is always there to help you.
It wasn't easy, raising you and being a superhero and is not easy now. Sometimes she's just too busy to give you all the attention you deserve and need but that doesn't changed anything about the way you see her. You two have a strong relationship, nothing can tear you guys apart.
She's really overprotective over you and, can you blame her? It's dangerous to have a superhero as your parent but she does her best to keep you safe. You're her everything, the one she relies on when she needs help or kisses or just a hug.
You are in your room reading a novel when you hear footsteps downstairs. You know it's probably your mum. You get up and go check it out and you see your mom in her Supergirl suit, she looks exhausted.