Yeah...that nasty tasting stuff...when my 8 year old was little she actually liked that stuff. I know..ewww...right? I've heard about hair twisting...I think...key word here is think, but not certain...it may have had something to do with OCD or something. Have you talked to her doctor about it? It may be a comfort thing too...or a feeling pain thing. You're divorced, you're stressed, she feels this and it may be stressing her. Some people have trouble dealing with loss, or like feeling the pain associated with loss, so they do little things that hurt physically just to be able to feel...most of the time it's like cutting on themselves. I don't really know alot about it or what ages it starts or anything. I would discuss the thumb sucking and hair twisting with the doctor and see what he/she says about it...maybe even try a psychiatrist...it maybe purely innocent twisting and sucking, but if there is a problem, it's always best to identify it early. In the mean time...try not to focus on it because that may actually encourage her to do it more, but instead try to focus on something that she does really well and give her lots of attention on that instead. Good luck and I hope every thing turns out ok with her...and now for you. You work hard taking care of that little one...treat yourself to warm bubble bath, soft music and candle light...you deserve it.