“AM I NOT ENABLING HER TO GO FURTHER AND FURTHER OFF THE DERECH IN 5 STAR COMFORT?”
No, you’re showing her that you love her and care about her. That never hurts.
“Trouble is,what she wears and says and does may be affecting the younger kids by osmosis… “
That’s going to depend on the particulars of the case. I would suggest speaking to Rov, if you haven’t already.