Oh good gods, that's the literal description of a ticking timebomb, for any of the characters on that episode. It has both the potential to be great or to be terrible on any conceivable level, to say the least.
The two big worries I have are Starlight "impulsively" using magic, and especially Celestia and Luna being "unappreciative" of one another. The "unappreciative" is what makes me cringe the most.
Good: If true, YESSSSSSSSSSSSSSSSSSS!!!! About time these two got an episode!
Bad: If true, whyyyyyyyyyy is Starlight involved in this? Why is she the one anyone would pick to help these two? Couldn't they just work it out among themselves???