I don't see any kink in either of those pictures.

I suppose it's possible it is so small you'd need to see it in person to find it, but I have my doubts it is there at all. From the top, if I try really hard, I can almost make myself see a kink.
I suppose if the snake cannot straighten it's neck out, then that would be a kink. But from the pictures it looks like the snake is just naturally curving it's neck. Did you ever notice that the snake did not straighten it's neck out completely ?

Did she say the kink was a problem for her ? Is she angry or wanting to change the trade ?

Does she think you traded her a defective snake on purpose ?

I wish you all the best with this. I am not an expert, but I still don't see anything that screams "kink" to me.

Gale