I've been trying to play her recently on dom games but every single game I cant seem to find a way that she is actually good. It doesnt seem like she does enough dmg compared to other ad ranged champs. Did she just become obsolete or does anyone have any suggestions for builds?

Not trolling, but if you're having trouble playing her with ad, try going the AP route instead. All of her abilities scale well with AP, especially her ultimate. Don't bother leveling your Q until everything else is maxed out.

Just try it and see how it works. I prefer AP Trist over AD.