What Ana should do, instead of screaming her fuckboi name in desperation, is use staff of vibrator she supposedly still held in her right hand and stab the back of the knee of meathead trying to kill Allen. The element of surprise of getting hit there, plus the pain it will dealt to meathead (back of the knee is usually protected and rarely getting hurt) will turn meathead attention from Allen to Ana, if she's lucky meathead will also drop the sword or even drop down entirely due to the pain. After that, she should call the rest of the guards outside and restrain meathead.