I sincerely doubt she would make a new song for it, but they'd use an already made song if anything.
Though personally, I hope they never use a song of hers ever again for Inu Yasha.
I didn't even know that they used TWO of her songs until you said that, and that makes me even more mad.
I hold a huge grudge towards Inu Yasha that only deepened by them using her song.
