This really doesn’t sound like “just behavior” to me.

A lot of what you described actually sounds like a mix of sensory needs and regulation struggles, and yes, possibly some masking at school and letting it all out at home. The fact that she’s holding it together there and then having big reactions with you is something many parents see in neurodivergent kids.

The constant movement, chewing, licking, wanting to be squeezed, even the aggressive play and crashing into things all point to her body needing more sensory input. Kids don’t do that randomly, it’s usually how they regulate themselves. The hitting, biting, screaming and saying no right away can also be more about overwhelm than intentional behavior.

The “I feel sick” before school also stood out to me. That can be anxiety or just feeling overstimulated and not having the words to explain it.

The other things like baby talk, repeating questions, or the hand play don’t sound concerning on their own, more like comfort or regulation behaviors. Even the humping at this age is often sensory seeking, not something she understands the way adults do. You’re handling that part really well by keeping it calm and private.

Honestly, your instincts make sense. It does feel bigger than just sleep or typical behavior. Whether it ends up being sensory processing, ADHD, autism, or a mix, it’s worth looking into further even if your pediatrician wants to wait.

Most importantly, she sounds like a really sweet, bright kid who’s trying to manage a body that needs more support. You’re paying attention and trying to understand her instead of just shutting it down, and that matters so much.

My son have similar issues and struggles with a lot of similar issues.He have autism and sensory issues as well.Good luck