A couple of weeks ago I had an interview with an alumni for one of my colleges. It went really well, and I extended my gratitude to her. However, I found out yesterday that it is often common, and even recommended, to thank them by writing them a Thank you card. I panicked,and tried to find out her address, but she didn’t give me a card, so I have no way to contact her. Should I look her up in the phone book? Will this affect her opinion about me in the interview?