I would think getting the tattoo at the base of your neck pretty much covers you on the "not showing" factor. This means that:
a) she totally brings out a black light to show her tattoo. I know she said its the one from her high school years but I am imagining the small hand held version that they have at clubs to scan for the ultra-violet stamp. Because you never know when the awesome topic of "do you have any tattoos" will come up.
b) that she likely frequents places where they have black light so she can show off her sick ink.