Monica did bring it to the attention of someone. Someone, i.e. a wizard who would actually be able to understand and act. It took great courage just to take that baby step.
I agree that given her history it took great courage to take that step. She was potentially putting herself in the cross hairs of the person she was asking to fix the situation. However, what exactly did she bring to Harry's attention? Did she tell him that her husband is creating drugs, participating in black magic, and killing people? She deserves credit for going to Harry, but that doesn't change the fact that she did not tell him the whole story and in a sense mislead him to what the problem was. She told him her husband was missing (true from a certain point of view), but was hoping to put the wizard on a collision course with the Three Eye Operation in order to shut it down. Had she told him more of the truth he might have been better prepared to resolve the situation without it getting as messy. Heck he could have kicked up to the Wardens who would have been all too happy to go medieval on that operation.
Putting aside Monica's background for a second, trying to do the right thing later does not erase moral culpability from earlier actions. If I and a partner rob and kill someone together and then I later go to the cops to turn myself in and give them information to catch my partner, it doesn't change what I had done. It doesn't paint my actions in a different moral light.
Does Monica deserve grace for her situation? Yes. Does Monica deserve credit for reaching out for help despite her situation? Yes. Does she bear some moral culpability for joining the activities in the first place, not reaching out for help sooner, and misleading Dresden when she reached out for help? I would argue yes, but as I said in an earlier post, that goes not equate to punishment. No reasonable jury is going to lay the hammer down on her.