I had to deal with the same thing. Usually your parents are much wiser and observant than their children. Try to have a closer relationship with her. Talk to her, spend time with her. Show you're you are appreciative with all of the things you have, and for her. Tell her that you wish you wouldn't argue all of the time and hopefully she'll understand.
Maybe she just misses you and wants a little attention from her daugher. Negative attention might be better than no attention for her.
good luck.