When or how do I intervene? Or is it a lesson one has to learn on their own?

this probably isn't a side taker persay....but i have a friend who recently got pregnant- like last week. She's not in a committed relationship or anything, but she told me she was getting an abortion-wed or thurs. Should i be worried about the fact that i see her fb pictures friday night she's out partying hard like nothing happened....drinking, smoking ect....she's living the fast life and i'm afraid for her