How to fix my wretched demon daughter? She's 13 and abuses me?

So I have a 13 year old daughter and I think she has become kind of bratty. She has a mac book pro, a flat screen tv in her room, beats headphones, iPhone 6, professional canon camera, an extremely expensive professional flute and violin that she begged for before and I got her private lessons but then she quit after two weeks and said it was boring and hard, lots of makeup from sephora and mac, lots of clothes from designer brands, exotic fish that were very expensive but she kept begging for them and said she would take care of them but she never feeds or cleans the tank, I always do it. She takes singing and horse back riding lessons. After driving her from horse back lessons and I told her she desperately needed to clean her room because it was a mess, and she told me to shut the **** up. I was appalled because I never taught her this type of language or disrespect. I told her I would be taking away her cellphone and she stomped her feet and screamed and cried and told me I was ruining her life. I felt bad for her so I didn't take the phone away. Her grades are Ds and Fs and the teachers have called me on multiple occasions that she has been harassing other kids. She invites a bunch of kids I don't know to my house and they always mess up the house and steal food. Her room is an absolute disaster and she refuses to do chores but demands $50 per week and for me to drive her to the mall.

JUST TAKE IT AWAY. YOUR THE MOM. IF YOU WE'RE Really RUINING HER LIFE (WHICH YOU AREN'T), THEN SOMEONE WOULD REPORT YOU.

-Yes, CAPS LOCK was required for this answer.

First off you have to have a real daughter because we all know this is bogus! You can always tell when schools out for summer vacation because all the bored kids come here to YA answers.

Let me condense your question down and see if you can spot the problem:
"I literally buy everything my daughter has ever asked for, and now she's an ungrateful little brat who doesn't respect me."

Getting any clues yet?

It's your house, not hers. Take all that stuff away and sell it. Take her door off the hinges, can't slam it if it's not there. Call the police on the kids she brings over, every time, charge them with trespassing. They'll stop coming over real quick. Be the crazy, *** kicking, cop calling mom. Give her something to fear and respect.

1. Make the rules
2. Enforce the rules
3. Stop buying her stuff. If she wants something she has to work for it.
4. Just take her stuff away! Make her study!

Your daughter thinks that she is the boss. No wonder why.

This is the only way. Please change things!