"rights" as an IC - flowerchild

I've been in the business for 20+ years and only recently in the last 6 months I've been working as an IC.  I gather that the advantage of working in this capacity is there are no minimum lines and you can set your own hours--at least that's been my experience.

A couple of weeks ago I made the mistake of contacting my supervisor regarding the overly zealous TL who was checking my reports (on a new account).  She constantly picked apart each and every one submitted; mind you, in the "real" QA audits I consistently get 100%; these audits are done by someone other than a TL.  

It got so I was avoiding doing any work in that account.  Hence (groan) the email to my supervisor, citing several reports that TL had done.

Well.

THAT was a big, fat mistake.  She not only defended the TL but took the time to review several of my OTHER reports from that account and make corrections as she saw fit.  This was demoralizing as heck, but the main problem was that she was wrong and wouldn't back down.

Case in point:  An ESL with whom I have no problem dictated under lab values "total leukocyte count 6.3"  She changed it to "WBC count 6.3," this after lambasting me a half dozen times for not typing verbatim/changing what the speaker said.

I listened to the dictation again and again.  total leukocyte count is what he said.  I pulled up all 294 reports on record from this dictator and in each and every report where there were lab values dictated, this is what was transcribed.

She said she took umbrage (her words) that I would question her corrections.  She can take all the umbrage she wants--the fact is she's wrong and won't admit it.  

So I guess what I'm asking is, to what extent can those in charge harass the IC help?  I want so badly to cite the 294 reports in an email, and holler about all the other erroneous corrections but unfortunately I need this job; I'm on the back side of 60 and really don't have the option of retraining in a new field.  

Thanks for anyone's point of view.