Nothing I can add just back up the people who said bad things happen whether you are in or out. There are a lot of non JW's who don't have babies out of wedlock, who don't abuse drugs who live normal lives. And there are JW's who do have these things happen to them. Basically don't shift the blame from her to not going to the meetings. If she didn't want to get pregnant than its her fault for not using protection, its that simple. Blaming it on non meeting attendance will only shift the blame and make her feel better because she is not directly at fault.
I'm not going to tread moral ground because I don't believe that people have the right to tell others how to live. Some people have children out of wedlock on purpose and don't believe that it is wrong, and others believe its a sin. Its up to you to decide that for yourself, not me. But if you do believe that it is a sin then don't take an attitude of "oh I couldn't help it because I didn't have Jah's spirit" or somesuch, it doesn't fly. You aren't facing your problems head on by looking in the mirror and saying, "hey, I screwed up"