It's unbelievable of your ex-wife to be so... well, you know the rest. You were obviously caring for your daughter. She's your daughter, too... Does she not care about that at all? (Sorry, I'm forgetting that people are not rational beings...)
When it comes to not having friends... I'd argue that you do have friends here. Of course, we're not real friends since we've never met, but we do care about each other's lives after leaving the cult. If you disappeared from the forum, I can guarantee you that some of us would notice that you stopped being involved here. Still, having no actual contact besides the Internet, we wouldn't assume you were dead. :D
Anyway, keep in mind that it's not worth joining them back. You see what they're doing. The elders whispering about you...? What right do they have? Do they not see that what just happened was a parent caring for his daughter? Well, Jehovah's Witnesses are that way. They don't see things until they are told.
If you want to be reinstated, many ex-Jehovah's Witnesses do it as well for the sake of having contact with family. But try not to forget in the meantime that this cult is... just a cult. A cult that has no power over you. Show them that you are a confident, thinking and well-meaning individual.