send another thank you card for second interview?

I had a second interview with the same person who interviewed me the first time. She thanked me for my thank you e-mail (because she gave me her email and said email was best way to contact her)- so should I/how should I send another thank you? And how would I make it a different thank you than the first time?
I was thinking of dropping off a handwritten card in her mailbox.
Thanks!