From my experience the only way any incriminating statement that your daughter made to law enforcement with respect to a possible crime that she committed could be suppressed is if she was not read her rights per the Miranda decision by law enforcement when she was being intrerrogated.It is unfortunate for her if she made any incriminating statements while under the influence of any controlled substances, but her withdrawal from the controlled substances when she made any statements she regrets will not be a basis for a motion to supress these statements.I suggest that she consult with a criminal defense attorney to assist her in the matter that you have written about.