When Tess turns up, it seems that they will never get along. As they can't see eye to eye on anything, whether it is the outcome of a case or what Jo calls her while out on a job (she doesn't like being called Tess in front of "customers") it really doesn't look like they will. Jo finds Tess bossy, irritating, frustrating and non-compassionate. She believes that all coppers should be fair and to her, Tess is too preoccupied with moving quickly up the ranks rather than listening to other peoples ideas - even those of her colleagues'. Even though Jo wasn't there too long, she found a friend in Maggie and she firmly believes Tess is a less than fantastic replacement for her.
Jo never knew about Tess and Jack's relationship, but she was upset when Jack left.There obviously is light at the end of the tunnel though, as the arrival of the new cop Jonesy seems to have created a new love triangle in the station - Tess, Jo and Jonesy.
Jo has a few skirmishes relationship-wise in Season 9, but the biggest would have to be a one-night stand with her colleague Snr Detective PJ Hasham. She moves in with PJ and Ben and one thing leads to another, leaving the pair extremely uncomfortable the following morning. A hostage situation brings them back together.
A shooting in the episode Teamwork has Jo undergoing councelling. PJ refuses to belive that she is not affected, and once again they find themselves in bed. In the last ep of season 9, Jo tells PJ that she loves him, but is heartbroken when he doesn't return her feelings.