i feel for you! just went through what you are going through at 25 months...here's my suggestions:
first, get her in her own bed.
you will be a new person getting full nights sleep. so, let her nurse in the morning or evenings for a week or two more, but get her into her own space for sleep. we ended up doing basic sleep training, alla sleepy planet, and within ONE night he slept better than he ever had after crying for 17 minutes. by the 3rd night he didn't cry at all!!! SERIOUSLY saved our sanity. i used to spend an hour trying to get him to sleep.
Then for getting rid of the morning/evening feedings, just use distraction and say that your boobies are tired and give her LOTS of extra love. Hugs, kisses, extra attention all day for a few weeks and try to give her more support for transitional objects. My son has not transitional objects really - no blanket, no pacifiers, no favorite toys...and i wish he did because it would be nice for him to have them. i think he may never have developed a lovie because my boobs were his comforters...