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That was the miracle, it's necessary since she's a saintess. It will become suspicious to others since she was appointed as a saintess and can't perform a miracle.

Recealed how she came back in the first place, proved she was a woman of her words as a mom, bolstered her saintess status...not really unnecessary.

It's honestly set up like the Count's "death" ie. Why would bianca be sent back if the count just died like that...and again, why should bianca die? Coz ultimately, it'll boost Bianca's decisions to keep moving forward, like what the angel said. In both occassions, Bianca didnt let death stop her from moving forward, esp since she's a saint and she should have her privileges (〜￣△￣)〜