My granddaughter thinks her mommy is money.

I started to tease my granddaughter.  Well kind of tease.  I would ask her where her mummy is.  Meaning of course her mother.  Well, it kind of backfired on me because now she does it to me.  Only instead of mummy she says money.  So she'll say, "Where's your money?"  This has a few possibilities.  Does she mean where is my mother or where is my money?  Or is she talking about her mother.  When you think that at such a young age she is asking where your money is it sure makes you wonder and is very amusing.