Not trying to sound disrespectful, but you act as if the entire world thinks her tattoos (and tattoos in general) are bad. Once again, just because you think they aren't what's best for her, doesn't make it true. I'm not saying I know what's best for her either, but the tattoos make her happy and who are we to say she shouldn't get what makes her happy?
(Just be thankful she isn't into scarification. That stuff is messed up.
)