Look at it in RX and figure out what her voice looks like (easy to spot). Use the brush tool or lasso then spectral repair attenuate. This was a quick attempt to tone it down. It could be done better but you get the idea....
True. Work in the RX Spectrogram View. The voice of the "talker" will be viewable as concentric lines in the area where they are talking.
This is a process I follow when I'm willing to be truly anal about getting rid of the talking. It's very time consuming so judge what you are willing to commit. I've been going back to some of my old 24 bit files and "fixing" ones that I want to listen to without the talking and screaming. This is also the process I follow when the talking is interfering with the music or vocals. If I want to bring down crowd noise between songs - that's different.
Remember that the loudest part of the talker will be closer to the bottom of your view.
That in mind, once I locate the the concentric lines of the talker, I go to the bottom of the display and SELECT a small area using the BOX SELECT TOOL that's the rightmost tool in the icons.
Then I use the magnifying glass icon that has the dotted lines around it. This magnifies everything so that now it's easy to start highlighting individual lines of the talker. I use the paintbrush tool set to a size that allows me to select the lines of the talker without affecting the surrounding areas. I start at the bottom and many times have to select every other line rather than the lines next to each other.
Once those are highlighted, I use the harmonic tool to select the harmonics out of range of the smaller selection that I'm viewing. Now attenuate or delete in spectral repair.Then I do the rinse and repeat thing - go back to what I missed the first time and do it again.
After I did this for awhile, I learned that I could see the talker lines in the middle of a vocal or interfering with the music so it's possible to really clean things up.
On recordings that I want to listen to and have egregious talker intrusions and am willing to spend the time - this has been working for me. My computer doesn't have the resources to split stems, etc.
Good luck if you try this.