what sort of ‘punishment’ she may expect once our marriage is public to all and input on what society elders can and cannot do over willful marriage of a baptized JW to an ardent disbeliever.
Nothing overt - no announcement that she is disfellowshipped (excommunicated) or anything like that.
BUT
She will be completely and utterly marginalized socially, particularly if you don't show any inclination to start "studying" with JWs (with the goal of converting you).
It will be "bad enough" once folks find out she married an "unbeliever", but once they find out that you also have no intention of ever being a JW, she will be "informally shunned". She will be viewed as "bad association" and never ever ever EVER get any social interaction with any JW outside of the Kingdom Hall. No invitations to anything, if you guys invite anyone (well nearly anyone) over to your place they will refuse.
I don't know how important it is for her to remain a JW, but it will be a very unpleasant experience for her if it still means anything to her. She will feel disfellowshipped although technically not.
Please think carefully about what you are doing, and talk to her about what to expect. Show her this thread. Do as you see best, just know that upon marrying you she will never again, or not for many decades, ever "fit in" with JWs socially.