There is nothing to the conspiracy theories, she’s had abdominal surgery and wants to keep her health problems private. The UK press are intrusive and horrible, and the social media conspiracy theories are just gossiping.
There are plenty of operations that would need a couple weeks of hospital recovery and about 6 weeks recovery at hone (Easter is only the end of March). People speculating are ignorant about basic medical matters and can’t let someone have their privacy. There is no conspiracy.