mom and sister, i get the feeling my mom is depressed?

[YoucancallmeYayat]

My sister is going to college out of state( she is already out of state she has been there quite some time now but less than a year; she came to visit us on christmas break) Well my mom sometimes says that i dont love her and that my sister doesnt love her either. My mom has gotten into a lot of accidents at work and her neck and whole body hurts she says. she is 45 and today she was talking about her dying and that she cant die. I think she was depressed today. Man i dont know what to do but it makes me cry when she says that me and my sister dont love her my sister hasnt called her today and my mom likes to talk to her everyday at least for just a minute and i dont know what to do i think my mom might be depressed. She works a night job and me and her dont spend that much time together because she sleeps during the day. When we are in the car she well tell me to stop texting and to stop listening to music on my mp3 because i dont talk to her, i think she is mistaken cuz i love her and i hug her and i act like im her baby to her so i dont know whats going on what should i do???