1998 Dodge Intrepid Engine won't crank

My Mom's 1998 Dodge Intrepid won't always turnover. It happens randomly, wet, dry, hot cold, etc. When she turns the ignition the dashboard lights come on, but nothing else happens.

She has waited and tried again and sometimes it starts.

She has it at her mechanic now, any ideas on loose connections, bad relays, interlocks or other things that mght fit these symptons?

Thanks