Should I ask her to delete it?

In 2007, my High School boyfriend of 1 year broke up with me. I was heartbroken. Partly because of the way he broke up with me (on the phone, after his best friend told him to, which he freely admitted at the time.) Mainly, however, because I was very close with his 2 older sisters. I considered them some of my best friends and family even. As soon as he broke up with me, he started telling them things that I had "done" or "said" and of course, they took his side. I wouldn't have expected any less. 4 years, 3 relationships and 2 facebook pages later and I'm happily engaged, expecting my first baby, and loving my life. Last year after another break-up, I had created a new facebook page and was adding people I had in my address book. My ex's older sister was one of them and without thinking I sent her a friend request. I didn't really care to go back and delete it as soon as I did it because I figured she'd deny it as soon as it popped up anyway. However, a few days ago it said "her name has changed her profile pic." At first I thought she had accepted my friend request and maybe we were on our way to some form of a peace treaty (at the least) but when I went to her page I still couldn't see anything. I figured it was a glitch in the system or something. The next day however I get 2 MORE updates on what she is doing on her facebook. I sent her the request a year ago and have never seen anything about her pop up until a few days ago but it's been happening every day and honestly, seeing her friend all these people gets kind of annoying. I can't for the life of me figure out how to cancel a friend request and I feel kind of silly anyway deleting or cancelling when it's been sitting there for a year. I'm just wondering if I should send her a message asking her politely to delete it or if I should just figure out how to delete it and do it anyway? Any advice?