What exactly is your goal here? Do you want MU advice or did you just want to whine and complain?
If it's the former, stop being so aggressive in chasing her and instead, be patient and punish the copious endlag on her moves. Focus on being close enough to her, that you can punish any Phantom attempts, but far enough you are outside her close range moves. If she's spamming Nayru's Love, use a disjoint to hit the latter part of the move, when the intangibility has worn off. Otherwise shield, then punish the endlag OoS.
If she is spamming her teleport, then punish the endlag on that move. There are only a few places she can be at any given time. Counter pick her with FD or other limited platform stages, then guess which way she is going to go. Positioning yourself to cover all platforms, while being close enough she can't easily spam stuff, should allow to shield when she starts it up, and then you can punish on reaction. Alternatively, forcing her to approach, by putting yourself in a position where she can't hit with Phantom and you can parry Din's Fire, will also work.
Keep her in disadvantage as much as possible, her options are much more limited. If you're using DeDeDe, consider switching to a secondary. That MU is horrible for him, and you're going to have to be precise and play her game.
If it's the latter, all I can do is give you the age old sage advice: git gud.