stuart lacey
i think the answer to how she was at work is because, major (her dad) was such a hard worker and i think went quite far in the army. So at work, she wanted to be governor and therefore thought she couldnt be friends with anyone as this could undo all her plans for her goal to be governor.
As with vera they tried the same story scenario, but showed her having friends, a softer side, which proved her undoing in becoming wentworth governor, so the writers probably wanted to try a different approach with Joan.
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