Did I ask for too much?

I'm 15 first off.

My mom is getting her stomach and butt done and it's going to be 7k, so I asked her if she could get me shoes (Before she gets her surgery) because I only have 2 pairs, ones are "Nike slides" and the other a pair I've had since last year. So she bought me some then asked if I wanted food so I said yeah and got food. When we were leaving the mall I said can we stop by Wal-Mart real quick? And she started yelling at me saying I ask for too much and why is nothing ever good enough.

I just want to know if I asked for too much.

For everyone saying what she spends her money on is none of my business.

It's not all her money, we got in a car crash and I got money too, she got 15k I got 13k. She bought herself a truck (10k) with hers so she's spending mine too.

Second off she just recently started buying me stuff, my grandpa has always bought everything I needed, clothes, shoes, socks , underwear, pads, everything.

She doesn't pay for the house we live in, my grandfather does.