Been there done that. Here's my advice. Sit down, talk to her and tell her that she's doing things that you don't like. Explain how the situation could turn around and go around and go the other way. It may not be tattoos but there's other crap you like to do that she wouldn't want you to. Tell her you love her and you want this to work and you're willing to make a few compromises and want her to meet you half way.
And about the fights, explain that you want it to come to a stop. If you guys are about to get into a fight then try ways such as cutting communication for 30min before resuming. Explain that the fight wasn't going to lead anywhere. It also helps if you guys do stuff together that you both enjoy.