If you want to win against her in milk fighting game this is what I did. At last stage she will hit you stronger than you can hit her, so don't try to trade hits because you'll lose. The only thing you can do in last stage is you have to jump to corner of map and wait for her to get to you. If she starts running at you hit her as soon as you can, but be carefull not to miss, after hit jump to another corner and repeat cycle over and over again, one thing tho. If she jumps right after you don't try to hit her then, just jump to another corner. If she jumps again jump to another corner, if she runs at you, wait in another corner and hit her as soon as you can. That's what I did and I win every time. Good luck!