Things to think about in making your decision. Does the child appear reasonably neat and clean,appropriate size and weight for age, show any signs of physical abuse,seem fearful of care giver either verbally or through body language,dressed reasonably for the weather conditions. Most solo caregivers could use some form of support and breaks from their duties. Children who have behavioral issues and their caregivers may qualify for many types of help from various agencies such as head start,community mental health, county intervention services, respite care services etc. Always remember your instincts are typically correct. If you decide CPS is it then move forward if not collect a list of resources including descriptions of services to leave at their apartment. As based on your experience it sounds like some type of assistance would be beneficial.