Thanks for sharing, don't think anyone else covered it before Oda here.
Suppose it's a good thing that she challenges herself, but damn. This sounded not good at all - it's probably making her sound worse than she is capable of. Sure it's all right on some patches, especially verses, but overall it's riddled with pitch issues, vocal breaking, volume issues, you name it.
She has the same problem with all these ex and current H!P girls covering Matsuura songs. The keys in most of her songs are higher than what these girls can sing by themselves solo and they really struggle/have nowhere to hide but be exposed. It just makes her sound like a bad, amateur singer and she is not skilled enough to cover her shortcoming on stage, which some experienced professional singers can do.

Having written that on her defense, a) this is not her song and that means no matter how much time she prepared leading up to this event, it probably wasn't enough - considering her other (ahem, main) job.
B) Again a good professional singer would still be able to cover other singers' songs with limited practice but she is an idol singer in a group and still what 19? (Still) gotta give her slacks. C) Suppose she would sound much better on songs that are lower in key. Even in this same event. It's not that she can't hit some random high notes, she probably can - it's the key issue here and it's evidently too high for her to sing without struggling.
Edit: fixed one word typo there -> nowhere to "hide"
