This is good, very good.

If I had to criticise it, I would say there are perhaps too many sentences beginning with 'She..." or "She was..." Personally, I think the 'was' word should be avoided were ever possible since, to me, it tends to make a story feel a little bit passive. Of course others may disagree.

Eg.

She was a picture of absolute submission as she stood with hands bound behind her back...

I might change to--

A picture of absolute submission she stood with her hands behind her back....

"...the sting of burning water" read oddly to me, but maybe that's just me?

Overall, an excellent piece of writing.

Well done.