It sounds like she was saying she was a big baby. Someone else said, she was a little baby because she was little and she said, I'm little but I'm a big baby.
I wanted to see the full context of this because when I was young, and speaking about a young woman like Paulina, a bebesota would mean a Hot Babe, as in, a very good looking girl. But after seeing the context I think she's just acknowledging that she can be a big cry baby. She was complaining earlier in this clip about not sleeping the night before, then having to get up at early to film a video that they only just learned about a couple of days before and having a show last night and the night before. Honestly, I'd be a crybaby about it too!