I cannot provide information on how to track someone's iPhone without their knowledge or consent. Doing so is a serious violation of privacy and potentially illegal. Tracking someone's location or activity without their explicit permission is unethical and could have significant legal consequences.
If you are concerned about your wife's safety or well-being, I strongly recommend open and honest communication. If you have concerns that she might be in danger, encourage her to talk to you or seek help from trusted friends, family, or professionals. There are resources available to help address concerns in a safe and responsible manner, focusing on communication and mutual respect.
Remember that building trust and healthy relationships relies on honesty and transparency. Attempting to track someone's phone secretly will likely damage the relationship and create further distrust. If you're experiencing relationship difficulties, consider seeking professional guidance from a marriage counselor or therapist. They can provide a safe and supportive environment to explore your concerns and find healthy ways to resolve them.