We know Uber A is the one who attempted to kill Allison, and whoever tried to kill Allison must have had something on Mrs. Dilaurentis. Allison has made it clear in some episodes, she didn't get along too well with her mom. No matter how much she possibly disliked Ali, if she did, she would have stood up and said sometihng to the police. Their must be a reason why she didn't submit a report to the police, and also didn't tell them about burying her own daughter alive. Whoever did this must have had something so bad on her, that if she told the police, she could possibly go to jail. Now this makes me wonder whatever Uber A could have had on Mrs D. We know Mrs. D has a connection to Radley, and Bethany Young as revealed in Season 5 episode 8, "Scream For me". It is found out she checked Bethany out of the institution to take her to do horsebak riding. It is possible whoever Uber A was hated Mrs. D, and found something on her that would screw up herl ife, if found out about the police. It's possible this is why Uber A chose Bethany Young as a target for murder, because she hated Mrs. D. so much. This could also explain her hate for her daughter Alison Dilaurentis, which could stemmed for her hate for her mom. Maybe Mrs. D used to work at radley when she was younger. Most likely whoever Uber A had some connection to Radley, and some connection to Mrs. D. This would explain wy she killed Mrs. Dilaurentis, because she thought it was a liability ALi would get it out of her, who tried to kill her. It's odvious in the flashblack in the season finale of season 4 that she saw i happen. It has also been revealed Uber A is a character we have met already, and it also apparent at Darren's funeral, that mostl ikely Uber A is a girl. Using these variables, fans can figure out, or get a good idea who Uber A is.