Jackie Was Appointed to a New Position as a Team

Jackie was appointed to a new position as a team leader during management restructuring.She was in competition with a previous manager.Jackie encountered resistance to change in her new team,along with a lack of cooperation and loyalty.Some members of the team maintained their loyalty to their previous manager and resented her promotion.Jackie received no management training for her new role.Several team members engaged in a range of increasingly hostile behaviors towards Jackie including:
-failing to provide assistance during busy periods.
-constantly whispering and making vindictive comments about her.-disobeying requests.
-making offensive comments and behaving rudely.
Ultimately,one of the team members called a meeting to which Jackie was not invited.They drew up a list of complaints about Jackie which they presented to her manager.The apparent objective of the bullies in the team was to get rid of Jackie.How can companies handle bullying in the workplace?