My story is like yours, and almost exactly. I am now 34 weeks pregnant and my son is 22 months old. I finally stopped nursing him completely about a month ago.
You just have to do it, kwim? He actually did okay. He cried of course, but not for long, and he adjusted very quickly.
On the other hand, it was VERY HARD on me!!!! I was surprised at how much it hurt me, and how much I missed it. I shed buckets of tears the first few days of no nursing. So, be prepared for that. I have no problem telling my son "no"...except when it came to nursing. It felt horrible to deny him that, so THANK GOD he adjusted quickly, or I would either have caved in or would have died of a broken heart.
So, if you truly want to do this you need to be very firm on this and hold to your resolve. It would only confuse her if you go back and forth.
Good luck!!!