T.S.
When we struggle with disciplining our children it usually stems from our issues not our childs. We often focus on the mechanics of discipline and neglect to honor what is really going on for the parent. I know that many parents fear having their child mad at them. We have been programmed to think that we are fully responsible for our children always being cheerful and happy and when that isn't the case we usually start beating ourselves up with unconscious judgements. These judgements are vicious and we often are not fully aware of them.
I would guess that your friend is really deep down feeling afraid that she isn't good enough as a parent and that interferes with her ability to follow through with her discipline. Sometimes, the best way we can support our friends is to stand in the place of non-judgement and compassion and support them in becoming more aware of their fears and self-judgement. Looking for the underlying feelings of your friend and just offering support may help her more right now than reinforcing what she isn't doing. She seems to be fully aware of what she isn't doing right and the things she "should" be doing and at the same time is stuck. The one thing she may need most right now is someone to actively listen to her and help her uncover her fears and to treat herself with some TLC. We are always our worst critic and especially when it comes to the "I am a bad mother." mantra.
I also support you having her join this website. I think it is an amazing resource. Just caution her to be careful not to take everything said personally. Each person that shares is sharing out of their own filters. It is important to take what is helpful and resonates for her and to leave the rest and watch for where it can trigger unconscious self-judgement. Best wishes, T.