Recently she's been humping my leg

I have a 11 month old girl pit/lab pup.

Just recently she's been acting strange towards me. She tries humping my leg, barks at me consistently at times, then whines.

So these Past few days I been playing outside with her longer then I usually do. So she's used to that routine now but I don't know if the humping is related to longer time of playing with her and giving her my entire attention?

She's not neutered yet. Could that be the problem?

Thank you