Should I let my 5-year-old live with her dad?

I am so sad. My 5 year old daughter has expressed to me that she wants to go live with her dad…and i get it. I have been struggling since we split up and doing my best to provide for her but her dad can give her things I cannot…he has a pool, his new wife is always there and theyre always going out and going shoppin…i understand why she would rather be there but i am heartbroken…do i let her go?