Wedding Albums for Parents

My sister has always been a very difficult person to get along with. She has a history of bipolar disorder which she is on medication for. She was my maid of honor in my wedding which almost didn't happen. Anyways, I made my parents a wedding album which I am giving to them for Christmas. It has a lot of photos of my sister in them and recently she has stopped talking to everyone in our family. She had an argument with my mom because she sent my mom a really nasty message in the middle of the night which really upset my mom. My dad then called her and basically told that she had no right to upset my mom like that. My dad also told her that he thinks her boyfriend needs to start acting like an adult and support himself. My sister's boyfriend has a job that pays minimum wage and he has only been there for 3 months and is about to be fired because he is constantly calling off. He plans on quitting soon anyways and working part time because he has he wants to go to college. He relies on my sister to pay for all of his bills because he pays child support and doesn't have the money to support himself. Meanwhile, my sister is working two jobs and going to college and they still don't have enough money. My sister called my mom up after she talked to my dad and she yelled at my mom because she doesn't feel my parents support her. My sister seems to forget that my parents have given her money to pay bills and have never asked for the money back. My parents shut down their business for the day to help her move a couple weeks ago. My mom went and bought some new furniture for my sister as well. My sister has deleted my mom, brother, sister-in-law, grandmother and I all from Facebook because she is angry at my parents. I have not talked to her since all of this happened so I am not sure why she felt the need to delete me as well. I am concerned that if they are still fighting at Christmas time that the photo album filled with photos of her will upset my parents especially my mom. I don't want to upset either of my parents on Christmas morning. Any advice?