Inference, Assumption, Presumption and Context: how are these the same or different?

I’ve run into a spot of trouble getting someone to understand what I say when I use long sentences or make several statements in a row. The person just doesn’t seem to grasp that the first sentence and words used have a bearing on the remaining portions and totally misunderstands me and then when trying to analyze where the misunderstanding is, decides I’m calling her stupid. Which up until that point I was not; certainly considering it afterwards! I’ve assumed that she had the same reading and grammar exercises that I had, we went to the same elementary school. So now I’m struggling to understand why I cannot use adverbs, adjectives and prepositional sentences to get my meaning across to this person. And why can I not expect her to assume or infer certain meanings for words that possess two or more definitions? We are in our 40’s, and employed, live in the same community, grew up together, we both function in society. Any thoughts? and no, she’s not stupid and neither am I.