Mommy has been downgraded to "Mom"

I'm not sure how this happened, but I am mostly "Mom" to Taylor now. She still says "Mommy" at times, but mostly it's "Mom"...not sure how I feel about this. Does this mean that she feels she is too old to say "Mommy" now?? I still want to be "Mommy" to her. She just sounds too grown up saying "Mom". Joshua still calls me "Mommy":) Thank goodness for Joshua! I may have to bribe Taylor into calling me "Mommy" still! She's growing up too fast!