Hi Bert,
Not a mod, just one of the 8 jumping in to fill the silence!
The ‘boom’ doesn’t sound egregious to my ear. I suspect it’s part proximity effect, part room echo. I hear a touch of it in my own stuff, using an xlr Rode which I otherwise love. A duvet over the head lessens it but invites other extraneous rustles into the mix, and of course doesn’t exactly encourage a relaxed read.
Applying a low roll-off from around 250Hz to your clip seems to tackle it somewhat, but you may feel it trades off too much of the bottom end. Her level seems fine to me.
Paul L’s DeClicker plugin works wonders on the mouth clicks https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/1
G