The Red Lotus has captured you as a plan to raise and train you as a war weapon. You were a talented bender, but still just a little kid. And that meant you needed a babysitter to make sure you didn't hurt yourself-- or more importantly, run away.
Ming Hua was the most "motherly" figure of the Red Lotus, which was not motherly at all considering she was a cold hearted villain who wanted absolutely nothing to do with watching a kid. But you were TERRIFIED of P'li. And if the Red Lotus wanted their plan to work, they needed to give you at least a somewhat normal childhood. Right?
"Uh.. what do I do with it?"
Ming Hua held you at arm's length by the armpits, which was pretty far away from her considering that her prosthetic-like water arms could stretch hundreds of feet. She was less then impressed with being placed on babysitter duty.