Complex naming formula

My daughter has dramatically enhanced the way in which she names her baby dolls.
Prior to today, every one of her dolls has been named after one of her classmates.

Baby Katie

Baby Lily

Baby Clara (yes, she named a baby after herself)

She has even named our unborn child after one of her classmates:

Baby Leila (she refuses to acknowledge that it could be a boy).

She received a new baby doll for Hanukah. After much prodding, she finally decided upon the baby’s name.

“It’s Baby Katie’s sister!” she said.

“Oh,” I said.  “Baby Katie has a sister? What’s her name?”

“Her name is Baby Katie’s sister! That’s her name!”

So now we have a doll in the house named Baby Katie’s Sister.

As an author, I find it difficult to name my characters, too, but this is ridiculous.