Daughters 72 dart not turning over

As above^^

Neutral safety switch is on the side of the trans on driver side. 3 pins. Outer two are reverse lamps, center one is NSS and it is grounded in P or N. Look at the starter relay. Two "push on" connectors

Pull the dark colored one, the yellow one is the "start" power from the key switch. Try grounding the tab on the relay that you pulled the wire off and see if it will crank. BE CAREFUL that it is NOT in gear

If it does, then either the NSS is out of adjustment or bad, or bad wire. If it will not crank, then it's starter relay, wiring to the ignition switch, or IGN switch bad

Wander over to MyMopar. You can download free service manuals there