Should I talk 2 her, or something else?

Well you liked her before then forgot about it, but then you still like her now, so that means you never lost interest in her, so I would talk to her before she sees someone else, then you will think, man I lost the chance again, so talk to her before someone else takes her or before she likes someone else, she must like you if she flirts with you, so that is a good sign, so go for it, ask her out, and talk to about how you feel, and see where things will go after that, who knows she is probably thinking why hasn't he asked me out yet, and she might think you don't like her anymore, so go with your feeling and ask her out, then you won't have any regrets on the decision you make, sounds like you two are pretty close anyway and that is good, so I say go for it, things will turn out for the best, hope I helped you! Good Luck!