I made someone really uncomfortable
How did you make someone really uncomfortable?
I asked her a question she didn't want to answer, but then I asked her again.
It is okay to be interested in a person and ask them questions, but you should not keep on asking the same question  if they do not want to answer it. You should not make other people feel unconformable.
It's not my fault she felt uncomfortable with the question.
It's true that you initially didn't know that the question would make her uncomfortable, but after you asked once and she didn't answer you shouldn't have asked again. It's not right to make people feel uncomfortable on purpose. You shouldn't keep asking questions that people who don't feel comfortable answering.