Slumberkitty, do you think you could talk to your T about your mixed feelings, and maybe ask her to clarify why they asked to see what you were doing?
I'd have mixed feelings too. When I was SH'ing, none of my Ts ever, ever asked to see what I was doing. It actually made me feel worse, I think... like even my Ts didn't want to see me or deal with it.

(I didn't always tell the last T, because his response was always to recommend DBT - but he didn't seem to know a lot about it!)
I'm not currently SH'ing (though I still want to, sometimes) - but I've talked a bit with current T about it (very reluctantly, not something I wanted to discuss!). She still doesn't know all the details. But, sometimes I wonder if I'd feel better, or more validated maybe(?), if she'd look at the scars. I don't know though. It's hard.