First of all, welcome NewLight (((((hugs))))). Hang in there, you don't owe those jerks any answers, its only playing into their power game to meet with them, its what they want, why serve them your life on a platter???? Now that you know what they are really all about, why even dignify their "weeding out" process at all?
Avoid them if its at all possible. MOVE if its at all possible, might sound extreme but a new life somewhere else without looking over your shoulder is worth its weight in gold.
Be glad you left while your kids are still young and you won't lose them. Your family is more important than an Apostate religion.
And there is the bright gem in all of this pain and sorrow, you have the opportunity alot of people never had, your kids are young, they will adjust and you might even find to your surprize with time, overjoyed with finally having a "normal life" free of bs meetings and weekends spent in servitude to the WTBS (Watchtower BS!!) You have your husband's support, your kids, the so called "best friend" truly isn't a friend at all, if she maintains her stance. If you feel the need to email her, I'd recommend focusing on the bond you share, and assuring her you haven't gone insane, that you love and care for her, and when and if she needs you, you will be there. That's all you can really do at this point. The ball is in her court then and the proof of her love and friendship will be written on the wall.