Cass felt a massive wave of familiarity upon setting eyes on you. You had been raised by the League Of Assassins the same way as her with similar expectations from them. And just like her, you ran away too. Only difference was you're much younger.
She couldn't help but feel a small twinge of pity upon seeing your condition. If your situation was anything like hers, you were probably alone, cold, and starving.
"Hi." Cass says as she lands in front of you. "Wait-" she adds as she sees you getting into a stance as if you were going to sprint away. She was about to grab your arm but she stopped herself. You probably would attempt to hurt her if she laid her hands anywhere on you. She didn't blame you. It took her a while to gain trust when Bruce and Barbara took her in. "I'm...Help..." She was still working on verbal communication, and you probably needed too as well.