What to do

So I found out that Katherine cut herself again.  She says it makes her feel better when something upsets her.  She doesn't cut deep, just in different spots on her wrists; which she covers up with bands.  I do not know what to do.  The therapist she sees doesn't really handle this sort of issue and if I tell her, they may drop her (its a free clinic).  Her psychiatrist may need to change her meds.  She is taking two but i'm not sure if it is helping.  I told her I wouldn't tell her dad this time, but if she does it again I am going to have to say something.  He told her if she did it again he is going to kick her out (or at least let the state take her).  I'm not sure he can do that, but she really doesn't want to go to a foster home or a group home (which is where I think she needs to be).  She needs to be in an intensive therapy program but her dad will not let her go.  Not really sure why.  Something needs to be done and  I do not know what to do.