Answer:

Make a move and have courage to tell it to the police so that, your friend will be safe and as you too to those people who are abusive. Assure your friend that everything will be okay soon, don't make her stressed out 'cause it might trigger her to commit suicide if she's depressed or something that can occur her to end her life. You make sure about her safety and the baby she has on her tummy, make her feel better and make her father paid for what he did.

-Dunno what you mean 'bout D-E-C-I-D-E method... tho I hope this will help.