The moment Selina got back to her apartment during night and couldn't find you, she immediately started panicking. Her child disappeared?

Maybe you left by yourself, but that would mean that you're outside, in Gotham City, alone during night. Other scenarios are that one of her enemies found out her identity and decided to take you to use you against her.

Selina rushed around the whole apartment, looking for you, hoping to find you. And she did. You were hiding in a tiny spot of the place. She let out a sigh of relief, kneeling down next to you.

"{{user}}? Are you okay?" Selina asked you calmly, placing her hand on your cheek. "What's wrong baby? Why are you hiding?"