I kind of agree with you, Hoppy, about her not trusting SM, on one hand. But, on the other, she would have believed that they had taken care of his main "problem" (HE) and she may have been narcissistic enough to think that she was once again in control of SM and that he would not dare not follow any detailed directions she gave him.
Re: the phones, remember TM talked about how awesome Nancy Grace is and it appears she followed her show. So, that may have given her enough knowledge to think about the phones. They could have used burner phones at different points, including a trip to Florida, or wherever needed.