x2. She's small now, and finding out what works in her world. this is dangerous pushy behavior, and needs to stop immediately. It's not about 'gentle' , it's about letting her know that this in not okay. I agree, pushing is a game. Maybe that squirt bottle, but that's awkward, and not always available. How about a swat on her behind? Or a tap with a switch? Or 'accidently' ding her with whatever you have in your hand? Not a serious strike, just a warning?
Talk to some experienced goat people about it for specific advice.
Mary
Talk to some experienced goat people about it for specific advice.
Mary

She's not as extreme though. Never butts me, just her twin.