I have a few things to say, if that's ok.

Your partner actually received more interviews than most, especially for a position at this level. 27% interview rate is good.

I'm concerned that your partner has applied to 100 places in two months. That's 12 applications a week! The generic copy and paste CV with small tweaks doesn't usually land well. While you might put two days into a single submission, put your heart into it, just for it to be ignored, the few times an application isn't ignored, there is fierce competition, usually with dozens of other CVs that do put a lot of effort into their applications.