Your SD is living in a materialistic world, and her understandable desires are probably enhanced by what she sees and hears from friends, the media, and commercial advertising. It would be unusual if she didn't want things that were beyond her reach. Don't we all?
She's nine, and has apparently had little experience with deferred desires, and little understanding yet of where money comes from and how it functions. You don't give details, but she may have not have had much practice budgeting an allowance or earning money for above-and-beyond chores.
So, her whole world view may be pretty unrealistic at this point. Rather than be angry with her for this, I hope you can see this as an opportunity to help her learn. I have a few suggestions:
Invite her to sit down with you and find out about family finances, budgeting, and your financial/material values.
Get involved in some kind of relief work; volunteer for a local food bank, clothing drive, or soup kitchen; show her what you give to charity and explain why it's meaningful to you; watch a documentary or two about how gritty real life can be for children elsewhere. Even a walk through a less-affluent neighborhood could start a conversation about how privileged her life is (but don't just start lecturing or moralizing – she'll tune you out).
Cut down on the amount of commercial television she gets to watch. This made a tremendous difference for my daughter at about that age – we left relative financial security, and the television, behind when she was in 5th grade and I left her father.
Find ways in your own day to notice what your are grateful for, and express your gratitude calmly and happily. Not as a big deal or an object lesson, just as a way to deepen your satisfaction and enrich your quality of life. There are at least a bazillion things we can notice every day to be happy about; a delicate breeze, the color of the sky, the perfection of a dandelion seed, a soft pillow, a moment of connection with your SD.
Worth repeating: don't lecture or moralize. That. Does. Not. Work. It didn't with us when we were kids, and it doesn't with kids today. Instead, get the wonderful and practical book How to Talk So Kids Will Listen, and Listen So Kids Will Talk. It will be one of the best investments you have ever made.