Resignation in Probation

Hi, my name is Bikesh and currently working in Bahrain for last 18 months. I have read multiple post and threads regarding the above mentioned topic but still wanted a clarification. My wife joined a local F&B company on 26th sept 2019 and was devastated to learn about the working environment. The company is not systematic at all in minor things and very unstable which has been sad for me and my wife. Long story short she applied for a job in a new company, accepted and offer was given. The company was provided a verbal notice about her resigning but the day when she had conversation the manager and owner threatened her that transfer is impossible and they will directly take her to the airport and send back home. They have been holding her passport which has been the main issue. As per my internet knowledge, LMRA guidelines and information from local Bahrainis, both the company and employee has the right to terminate the contract during probation with 1 day notice and its illegal to hold the employees passport without their consent and without the receipt of acknowledgement. My confusion is shall i go to LMRA or the labour ministry to understand the procedure? And can they send her directly back to Nepal as even if the visa cancelled and contract terminated, there is 1 month grace period? I'm aware of the resignation notice needs to be sent through post office if they don't accept it. What is the correct course of action to resolve this issue? Your advice will be highly appreciated.