CorvusCorax
Deary me...
My pup has been doing this, it's often pushy behaviour, I want food, I want attention, me me me, push push push - I hold a treat (well, I take it out of his daily food allowance) up at my navel or a few inches out from my crotch to encourage him to stop there, not head on in and headbutt me *there*
or just use a hand/rolled up newspaper or something to block her if you don't want to bribe her.