Without seeing what the woman looked like, it would be inappropriate for me to judge...so I won't.
If you felt she was inappropriately dressed, I'd certainly have emailed NWA. But I personally don't think this was the appropriate forum. Nothing was accomplished, and if anything, NWA may end up thinking "just another whinney Elite..why should we listen?"
While how one looks is important, did she provide timely, professional service? If she did, the email could be "so and so did provide a high level of service. I was a bit concerned about her appearance..".
Most of the time the people I meet at NWA are professional, hardworking and a credit to NWA. Unless they have hygine problems etc, my test is the same as that great thinker of the 21st century, Larry the Cable Guy, who exclaims with passion "Get eeeeeeeeeerrrrrrrrrrrrrrrrrrr done." That's what it ultimately comes down to.
I only hope the OP isn't dependent upon her in a emergency situation sometime.