Being a female....and into cars..rmm... Most girls need attention and if your not giving it to her she is going to nag/whine and well if the only thing your doing is spending time with your car she will call you out on it! Maybe explain to her "This is what I like doing if you care for me the respect that" Maybe even ask her if she would willin to learn some about your car and if she has a hobby maybe try to help her or be a part of it. I never understood why people change or people try to change someone they are with....if you love them you love THEM. No matter what they do or how they do it! I learned the hard way but someone who loves you does not and will not try to change you or what you enjoy in life. just my two cents!!!