If I were you, I'd get her first and middle names, and leave off her last name. I know I'm being hypocritical, because I've got Ianto's full name and will probably continue that trend with the rest of my kids, but it looks a little neater if it's just name-middle name for some reason.

Could you incorporate a little picture into it somewhere?

Also, where you put in depends on whether you think Kailey will be an only child or you want more. Say you want her name on your wrist - it would look a little unbalanced if you go on to have two more kids. You only have two wrists, so where's the tattoo with #3's name going to go, YKWIM?