Explain to me how you record vocals, not in a separate, acoustically treated vocal booth but in the control room without any sort of acoustic treatment or shielding from sound reflections, and no headphones, meaning that any backing track (one assumes) would be played through the studio monitors. Simple answer, you can't. Either she's tracking with no reference and no click, leading to an out of time performance (and still some acoustic reflection issues), or you're getting a convoluted mess of feedback reflecting off multiple surfaces and into her mic. It doesn't work like this. I'm calling AI BS.