My 4yr old told me she wants a new mom?

My four year old daughter was watching the Rugrats movie and on a part where Chuckie sings this song "I want a mom that will last forever" she came up to me and told me she wants her for her mommy. She said she was really pretty and nice and she would hold her hand. I told her that I hold her hand and take her lots of fun places. She told me that daddy would like her, she wants her to be her mommy and I should go live somewhere else. I am hurt by this and really not sure if I should just blow it off or take it to heart. Is this normal for a four year old to say?