i'm afraid i'm quite militant on sleep. i would aspire to be like mama but alas my personality will not allow it. 
i just cant get through life on little sleep. unfortunately with 3 under 2's in the house it is perhaps a twice weekly thing to get through the night without at least one of them waking up!
but they are all capable of sleeping through. and i totally get where you are coming from about parenting being relaxed and co sleeping etc for years.
its the curse of modern society that mothers have to return to work, fit in school runs, football practise etc.
i understand that when everyone aspires to having their baby sleep though, self settle and you have a different way, it feels like they're saying your way is wrong. i think your way is fantastic- hence me always refering to you as an earth mother! i imagine you all serene (long red locks flowing) barefoot, while your children do painting, get muddy and you're all smiling.
me- i wouldnt even buy the paints, my hair is more likely matted and im saying in a high anxiety voice, argh you're filthy, dont move until ive wiped you! 
but and its a little but, i think out needs to try something else other than what she has been doing cos she cant function. if its getting to the point of affecting her relationship with him, then something needs to change.
i think what im trying to say is, its not a criticism of your way(although i can see why you would think that) but its more like saying, that this way, isnt working for HER.
Sorry mama if that sounds patronising. it isnt meant to. ive worked very hard on the wording and explanations- so as to not upset you. 
i wish you lived in england out then i could come and support you. 
not sure whether to try to give you advice or not, because i dont recall that you asked. i will wait until you do. x