Extend multiple visit visa through causeway

As I responded to your private message, she may need a visa for Bahrain for Saudi immigration to allow her to exit.  People on these forums have had varying luck.  Some were allowed to exit and turn around but most were sent back and asked to get a visa for Bahrain.

This ans is not clear about my topic

Read carefully.  It is clear. 

You asked if you can extend Saudi visa through the causeway i.e. exit and re-enter without going to Bahrain.  I told you that in most cases, Saudi immigration will NOT allow you to exit without you having a visa for Bahrain.   Unless the officer is in a good mood.

But the instructions from gov and rules are???

I already told you.  Try and read.  You need to have a visa for Bahrain to go via the causeway - that is the rule.