Development Team Not Improving

Hi We have an issue with our Product Owner. She has limited agility background but a nice mind-set, and gets along well with the development team. She does not micro-manage. She has to deal with the team but not getting proper results. The developers in team like coding tasks and hate scrum meeting and testing work - they don't attend meetings most of the times and keep on working on tasks. Many stories are getting rejected by client and client is complaining about not getting business value. Also technical debt is getting worse. How to tackle this situation? Please any ideas?

Posted By - Christian