How hard must it be for these girls to see their mothers fall back in to their former worldly ways? If you know a girl in such a situation, please remember to pray for her!! You might not be able to actually help her physically, but you can at least pray she makes it through the battle going on in her own home.
If YOU are such a girl, please keep pressing on in the truth! Remember how the Lord says for you to be: meek and quiet. Arguing or pressing your point or trying to 'preach' to your mother will not help. Just be a quiet example and do what you can to please her and help her.
Another thing I've been thinking about is the verse that says the rod and reproof bring wisdom but a child left to himself will bring his mother to shame. I see two ways of understanding how a mother could be brought to shame but I'll share the one that just came to me recently. There is a shame that comes to a person ... like a lazy person that can work but chooses not to or, in this case, a mother that is too selfish to take care of her children properly. The shame has nothing to do with the child and everything to do with the selfish mother. Sadly, this mother is usually so wrapped up in herself that she does not even see the shame of it all and maybe never will until it's too late.