There was a medical reason, the device was considered unsafe. Any experimental device is considered unsafe without monitoring, and monitoring was no longer available. That's why she chose to have it removed.

Anyone who signs up for a clinical trial knows that their treatment can be discontinued at any time, even if it is helping them. For example, if an implant is helping you but is found to be harming other people, it may be considered unsafe and you may be advised to remove it. In fact, a different article suggested that other patients were experiencing adverse effects from this experimental implant. This might even be why the company couldn't get their product approved and eventually lost funding.