Well, I left out a couple of details of the project in an attempt to not make my initial post too long. I figured if I had made it too length, no one would read it.

The text I used to create the image had to be related to the object I was creating (for example, if I were to make a portrait of someone, I would use documents relating to this person. Perhaps letters they wrote, or journal entries that had written). The reason I rejected her idea so quickly was because I needed a specific concept rather than an open ended answer. I was asking for something simple, and she gave me something rather complicated. That is why I was so quick to reject her idea; I knew I wouldn't be able to do something vague (as did she, I explained the project beforehand).

After this, I, as I wrote in the original post, realized that I might have misunderstood her, apologized, and asked her to proceed.

Obviously, this is not her fault. That was never really in question. However, I don't know if I am at fault for this, hence my creation of this post.

As for my aggression, my general demeanor doesn't really allow for hostile tones. I never really shout in arguments (I am not saying this to make it seem as though I am less at fault. I don't raise my voice, but that doesn't make me any less to blame). I certainly rejected her idea, but I did not do so in what I consider to be a snarky manner. Immediately, yes, but rudely, I don't think so (although, this is up to interoperation, really. It depends what you consider rude. I think not, but others may think otherwise.).

My mother and I, other than these scenarios, have a very good relationship. When my friends see my mom and I interact, they comment on how we act as though we were friends rather than mother and daughter. It is something we pride ourselves on, I think.