Should I keep my opinion to myself about my mom's actions?

She met some guy on the internet in another state and has him staying over (even when she is at work). She's in a bit of financial trouble right now because she got scammed on the internet before. We live less than a mile apart yet she never comes by or calls to see how her 3 grandsons are doing. Whenever we go over to her house, she sits on the computer, instant messaging her "guy". Now she has told my brother and my oldest son (14 years old) that she is considering moving to this other state to be be with this man. She has asked me on multiple occasions to "babysit" her 3 dogs. Now she wants to sell them - they are costing too much to care for. One is a Great Dane and the other 2 are Chihuahuas. I offered to adopt them, but I'm not going to pay her. She still has them. I have also noticed that when she does call our house, it is only to ask me to do something for her. I'm very upset by the situation, but I'm afraid to overstep my bounds and say anything. So, I keep it to myself as much as possible. My mom and I have a rough history to say the least. Should I just cut my losses and bid her farewell?