help about if I should tell my salary and bonus package to HR of

Hi everyone,
I had an onsite interview recently. The HR asked me base salary and bonus stuffs. I did not feel comfortable to talk about it. Anyway I think that they can find my base salary, I told it to her. She continuted asking my bonus stuffs. She even asked me to write her an email about it due to that she had to leave the interview earlier. Can I ignore it? If not, what should I do? In addition, if they ask you if you are applying for other jobs, how should we answer it? Thanks a lot!