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I would have to go with infamous. If you really want a good game that is on the PS4 then I really think that you should do your best to pick up this game I will tell that she will love to play seeing that she sound like she loves to play video games.
I would buy Infamous Second Son for her now and then preorder either Destiny or Unity, both of them are going to be insanely good games. Infamous will keep her occupied until either of them two come out, it's a great game too.
I love Assassins Creed! You have to get her this if no other game. She reminds me of myself because I play Xbox most of the time and only recently within the past year and a half got into PS4. Also, you need to check out the Preorder games available on Amazon right now. There are so many options to choose from but to be on the safe side, just go with Assassins Creed: Black Flag for the time being.