"Don't ask, don't refuse" is a cruel joke this house.
I have never "offered" to nurse my children after a few months old, they ask in whatever way they can, if I offer before that they will/did flip out.
I am currently setting limits on dd nearly 21 months, and it's not going well. She was nursing seriously 20 times in 24 hours easy, and I was going bonkers, I've been night weaning, we now nurse to sleep then not again until 4:30 (when dh goes to work) it goes fine until about 2 or 3 am then forget it. I've also in the last month started only nursing at home, at 20 months old I don't want to nurse in the store. So now she still asks all the time and I tell her when we get home (even though we do daily activities we are never gone at any time for very long). The only time she doesn't throw a fit is when we are at the zoo. For us it's not about being busy, if we are home or out nursing is all she wants to do. I'm sore, resentful tired..... For me even though I'm dealing with miserable fits, it's either wean or limits. I know there are plenty of moms here who nurse on demand until the child weans but I can't take it, I really cant.
She is also getting really bad with her latch teeth etc. Mabye someone will have real advice but you aren't alone.