Coming from a female, if she is not even responding to gifts, its safe to assume that it is over. The best thing to do is let her go her way, and you go yours. If she wants you back, make her come to you since you have already exhausted all your ideas to get her back. Losing love is never easy, but if she really loved you as much as you loved her, she'll come back.
With that said, its up to you if you want to wait for her to come back, but it'll be painfull for you to wait day after day to see if she'll call, come see you, or say hi when she passes you on the street somewhere. And not to down her, but why waste time missing someone who doesn't care about how you feel? The least she could have done was tell you what was on her mind for why she wanted to leave you instead of just leaving you wondering. I think you'd be better off, but that's just my opinion. Hope things work out for you.