What an awful thing to happen to a girl. To go from homely to beautiful in a year, especially in your senior year of high school, is a horrible thing to happen to a nice girl. Its like winning the lottery. To go from abject poverty to winning millions. But if you read about what happens to those that win the lottery, most end up in abject poverty again because they never learned to handle money and there are hundreds of people that will be so happy to take that money away.
There are hundreds of guys that will be happy to use her and her beauty for a moment of pleasure. When she wakes up in abject homelyness again she will curse the beauty she was given and all that it cost her.
It was hard for one of my daughters to handle the beauty and playboyish figure she was given. She was constantly approached for "fun and games". Fortunately she married a grade school crush who loved her before she was beautiful. He got to marry a beautiful girl and he treats her very well. She now has 4 delightful kids. But it was hard for her to reject some of the varied "offers" she was given by some very handsome and some very powerful men. We spent some time talking about the pluses and minuses and I'm glad her mom and I were there for her to help her keep her head on her shoulders. The Disney style storybook ending could have been a Shakespearian Tragedy instead.
"There is no success that can compensate for a failure in the home." I hope you can help your friend keep her head on her shoulders and help her realize that a loving husband and good kids are what is really important in life. The fair weather friends that come by for "fun and games" will be fleeting and she may wake up some day and realize how much her Lottery-beauty has cost her.
Your friend really needs to confine her "flirting" to her husband.
Good luck to you and yours.