Pretty telling that she seeks to position her PR officer as her 'best friend'. I suspect that, like many a PickMe the world over, Jack finds it difficult to forge genuine and deep friendships with other women.
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Yes but I think it might be a bit more than that as well. As long as she was with people like Leggy and Louisa, she was still connected to the world of real fame, celebrities and media. That probably had the effect of keeping her scammy behaviour in check as these women would have been very concerned about their personal reputations in the media industry. After all, we know that LJC dissuaded her from crowdfunding a house.
Once LJC LEFT, and DKL was an obvious unmitigated disaster, Jack no longer had any sort of genuine claim to media and celebrity beyond Twitter, so there was nothing holding her back from degenerating into full on scamming.