Please help me!!!!!!!!?

I have a problem I want to solve because it hurts me to see it this way. It is my mum. For years, she has been a feisty person. She may be very easily angered and prone to physical punishment, but she had incomparable love for me (btw I'm 15). She always used to buy me things I wanted, and made sure that I worked for it. In my eyes, the best mum ever. Recently, my family amed a bit more wealth, enough to relocate into the more upscale areas of town. My mum's behaviour, has correspondingly (I think), changed. Previously, any problem I had could be solved by her and she made sure that I had a good life. Now, she hardly listens to me at all. I'm serious. She may pretend to listen, but even in a casual gathering, she would suddenly cut me off and talk to somebody else. Now, a few days back, I told her when I burned my hand on an open flame, and je replied nonchalantly "Good". She doesn't do this to anyone else. She gives the most attention to people working under her (her position is seniormost but in a very small company, the company is stable as it has been running for 10 years). I feel as though she may switch me or my sister for her colleagues. I'm not just saying this. The moment she leaves them, she turns all grumpy and snaps at us. She igned me to make a short movie, and though I'm not trained in any sort for this job, she scolded me the whole time for poor job. When she decided to get a professional to do the job, she was patient with her the whole time. I asked her once why her behavior changed between us and she hit me while saying that she needed to motivate them to work or they would quit. Does that mean that she cares more about her workers than me? Another thing she always does is that she criticizes me on my appearance. She always complains about my dad to me but when it comes to mr telling her about my feelings, she rudely cuts me off and changes the subject. How can I change this? It really hurts me to see things this way. ;((