3 Days of Love and War

Harry Potter is worried about the mane six and how they are fairing, so he writes to Rainbow Dash and Dash writes back saying that there was war in Equestria and that she might come back if Twilight Sparkle could get her there. Now Rainbow has 3 days of love, but will that be it? This story takes place after my year 2 at Hogwarts and season 3 of MLP.