taking it too far?

I found a pink binky in a purse I hadn't used since last season. . . Viv got a hold of it, and likes to pretend she is a baby. She calls Sophie "mommy" and when she calls for her, I get very confused and have to ask,
"Do you need real Mommy or Sophie Mommy?"
She replies, "Sophie Mommy."

Anyhow, today she came out of her room wearing her pink/blue cap from the hospital!!! And also her binky was stuck in her mouth. . . hopefully Sophie won't start breastfeeding..