Okay here goes i am thirty years old i m in a relationship with a good guy we have had problems in the past b?

okay i am in a relationship with a good man although we have problems in the past things have turned around for the better i am a thirty year old woman we have a huge house that we are renting to own i say all of this because i want to help you understand the reason why a friend of mine wants t live with me ,it's because she has two children and made some poor choices in life and does not have stability in her life she wants to come stay with me and my fiance along with her two kids ,i have three dogs and the girl i know lets call her laura laura likes the fast life she loves thug ed out drug dealer boyfriend's ,she loves drama and and loves getting plastered i somehow think it would be a huge mistake but she is both i and my fiances friend from our ld neighborhood.. and another thing is funny laura is highly two faced and loves sleeping with other people's men and sleeping with the best friends of her boyfriends i am not trying to insult her just need some advice i know i'm babbling please help