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She was basically just saying that she understands her position and wouldn't dare to be greedy. Such as ask him to help her or spend his free time with her or anything around that matter. The conflict part is referring to if they were to continue to spend time together feelings might get involved and the whole purpose of her being there will be discarded. She is there for one purpose and one purpose only. She knows he wants to sleep with her but she not on that. So in a way she is saying I'm focused I know my place I will not cross any boundaries and she hopes he does the same.
That's what interpreted I could be wrong tho.
Maybe I'm illiterate or something I didn't understand any meaning of her letter to him.