How to deal with my spoiled wife?

My wife of 25 years old is spoiled. I recently bought a new Samsung note 4 from t mobile and paid the whole price to change it to metropcs. I also had to paint my car because it had some scratches and get a new bumper for it since it had a broken corner. My wife told me she needed a car to take our kids to the doctor because her sister never wants to take her to the clinic. I bought her a $2,350 car. It works fine but she says that the engine does not. So her dad let her borrow a car. Two months ago, her laptop didn't work anymore (she works from home) and she asked me if she could buy a new one because she needed it. I told her no but she went ahead and told her dad. And between those two months ago and now, our son dropped her cellphone in water so it didn't work anymore. I said, pawn shop. So she called her dad and told him not to call because her cell phone didn't work. So he bought her one because apparently he needs to 'keep in touch'. I appreciate him giving her stuff but she doesn't need them. She is very spoiled and it has been going on for the three years we've been together. I don't like her spending all that money either on expensive things that's why I don't let her buy them. Then she asks me why I buy expensive things and not let her. I told her because I need the car for work. It needs maintenance also. Not just her. How can I stop her dad from soiling her and expecting I would buy her stuff or let her spend her money on nonsense.

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