Make her wait 6 months. Believe me, she may hate you now, but she'll appreciate it when she realizes it's not that great of a tattoo after all, if she didn't design it. I have a tattoo on my shoulder that I was allowed by my mother to get, and I wish she wouldn't have allowed me to get it because I absolutely detest it now. It'll cost roughly 1,000$ total to have removed, if I don't need extra treatments (thankfully it's mostly red and black), and it's not something I want showing when I get married!
My cheshire cat on the back of my neck, on the other hand, I drew myself and absolutely love. I waited 3 months and had a picture of it everywhere. In my bathroom, on the headboard of my bed, on the wall in my office, everywhere I could possible be during the day. I never got sick of looking at it and it's my favorite tattoo!
I'm sorry, but you are dead wrong. I work in a position of trust with a structural engineer. I'm privy to sensitive data day in and day out. My tattoo has never once affected my position within the company, if anything it's a display of creativity to my colleagues and other companies we work with directly. I've gotten more compliments on the tattoo within my field than I have ever received from outside sources.