Because that's exactly how it sounds, and I LOVE when she gets caught up in actual sounding words out, and not worry about how it might not really be spelled that way.
I also love what Norah said. She asked me to tie her nightnight on her like a cape so she could be Superman. So I asked her if she wanted to be Super Norah instead and she told me "NO I not Norah, I Superman!" So there.