She'll be 2 and hasn't had any yet?? I think that would actually increase the possibility of being allergic if she never has any in the first few years then she hits a green light and starts eating nut butter all the time for sandwiches, etc. Overdoing it is what causes a lot of allergies from what I've seen. (both food and pet/environmental allergies)
What I'd do is go ahead and let her have some occasionally in a safe form (ie, spread thin on something, or cooked into a cookie or etc) if you're worried about choking. Slowly increase the amount as you see her being able to handle it. I cant imagine peanut butter sandwiches (either crackers or bread) could cause choking (unless you put a big dollop on it???)
Also want to say that if your kid does not like something (for my husband it's fish and milk, for my son it's peanut butter and milk) even if they dont seem to be allergic to it, if they naturally avoid eating certain foods, it may very well be because their bodies does not tolerate it well. My husband often will get sick (diahrrea) after eating seafood, so no he will not eat fish. I dont think that is an allergy but more of a sensitivity? Milk also upsets his stomach. I personally was never big on drinking milk growing up so when our son did not want milk as a baby or toddler, I did not push it! Water is what all of us prefer to drink and it's good for us so, fine. It just didnt help my son gain any weight, oh well.
I wished my son would eat peanut butter since it would have made feeding him a lot easier. When he had late lunch in kindergarten, I did not want to send ham sandwiches not knowing how long it would stay cold, so I made Nutella sandwiches. Over the school year, I gradually mixed PB into the Nutella until by the end of the school year, it was 2/3 to 3/4 peanut butter with nutella. Now he will eat peanut butter fine, just not often. He will also occasionally ask for a glass of milk but still prefers his cereal dry, prefers to drink water, etc. As long as he gets his nutrients from other things (yogurt, dark green vegs, etc etc) fine.
Sorry so long. J., I hope you dont feel I'm targeting you, just saying what I think and have observed and sharing with you and all the others who'll read this.