Is it normal to become friends again with my enemy?

I use to be friends with this girl named Alissa we use to everything together, then one day she just started being rude to me.

Alissa and I use to be friends, we went to the same school so we would walk home together because our homes weren't the far away from the school and we live close to eachother. We did everything together study, shop, ride our bikes and more.

On my birthday she gave me the newest iPod and 3 cases, one said #selfie, the other had a a pic of us and the third one was a panda. On her birthday I gave an Instastack. As you can tell we were the best of friends.

I had another friend named kataya, she was friends with Alissa for 5 whole years. But then one day Alissa started to be rude to her and made her life miserable. But for some reason I didn't believe her.

At school Alissa started to give me these dirty faces. After school I started to talk to her, she said that I have been spreading rumours (which I hadn't). Ever since that day, she has forever been doing horrible stuff to me. Once I was walking home and I stopped because a car was driving past, she kicked me on the leg and pushed me onto road, I couldn't move my leg because how hard she kicked me. Lucky for me the car stopped. The lady helped me up. On my leg she kicked me had a huge bruise and in then middle a cut. She would always spread rumours about me at school.

Ever since that day she never has left her house, she always stays home watching TV or playing on her phone, iPad, iPod, laptop I think you get the point now. I kind of feel sorry for her. Always at home bored doing nothing.

Should I confront her and be friends again or just ignore the feeling?