She is singing in swahili and here is the translation:

“Forgive my bad faith
Forgive my absence
Nonetheless I love you
But I don’t know how to love
Forgive me for the lost time
You waited and hoped
Forgive my ignorance
Forgive my denial
Forgive my silence
To you who loved me
Forgive my anger
You have the right to forget me
But forgive me.”