Your MIL needs to leave as her presence is making your and your wife's issues worse. she is most likely to drop you in it so be careful. If elders come over say you are strugggling with your own personal health issues made worse by her visit. You know where they are and will come to them if you need help.
Give time for the dust to settle and some level of peace to be restored. Your wife at the moment is caught in a miserable place in the middle of it all and she needs time to recover her equilibrium. So don't dis the MIL or express your frustration with her or the society. Instead speak positively about your wife, how much you love her and how you have missed being alone together.
Focus on getting yourself stable and calm before worrying about anyone else. Cult counsellors focus on healing self before you are in a position to heal others. Keep the lines of communication open with your wife and do not pee on her sacred tree i.e. do not disparage her faith and ideas or the leadership. If you do she will close communication and feel threatened.
The MIL goes home tomorrow best news ever but she will still try to interfere from a distance.