She's not over her ex, what can I do to help?

I need to know in your personal opinions if this is normal behavouir, I am worried about a friend have been for a while now, people have noticed changes too & I am very conerned. I know you may say it is non of my business or leave her be, but just please try and understand. I found out some of this information by accident, and I wittnesed some of it, and I also was told some of it. My friend who I share a flat with, spilt with her ex around the end of June last year. For the first 2 weeks, I have never seen someone so broken, hurt or loss. She competely lossed control. She came home, didnt say anything but went on the internet and joined a dating site. A week after, she tried to cut herself so badly that she would end up in hospital, she wanted to "feel" some other kind of pain. She succeed and rung her ex's home, but his mother "lied" and said he was working. However, his sister texted her later that day & asked how she was. He texted her a few weeks later to find out how she was and she said she was fine. I was so worried about her, she never ate, never spoke. Was dead inside so to speak. Thankfully, this guy was very nice who she started talking to on a dating site. Her brought her back out her shell, and she started living her life again. She was eating, drinking fuilds & sleeping. She however met him, went back to his and gave him a ********, which is competely out of character. She met another random man and slept at his house. She's meeting all sorts of men & planning too. She is drinking a lot, has so much confidence, is cheeky, answers back, she doesnt look like herself anymore, she doesnt act like that sweet, innocent, carful girl I know. She is still so kind and caring. But just so wild, flirty, bold, confident. She hasnt "greived" the realtionship. She hasnt accepted it either. I know she doesnt want to talk about the spilt. But her parents dont even know they have spilt. She denies it. I feel she needs to sit down. Think about what happened. Cry over it. Have a break from this dating site. Shes up all night and wont sleep. Its been nearly a year. Is she greiveing? Acting this way because she is not accepting the break up?