I know it's challenging and sometimes downright painful, but be persistent. It will pay off. If you need support, get it. The Australian Breastfeeding Association has great information and practical support as well.
I think I would suggest not to stress too much. Also to consult a lactation specialist if she has access to one. The best thing anyone ever told me was to "take it easy" and that "the worst that could happen was that the baby would feed through the bottle" and that was not too bad at all. That's all I needed to hear.