I notice that, just as on the old pre-Christmas to her post, grannygranby has not come back to discuss any of the responses to her thread. That, to me, is just rude, particularly on the old thread which ran to eight pages. She clearly does know what the problem is, but just doesn't want to acknowledge it, as that would put the onus onto her to make the necessary changes to improve the relationship with her daughter in law (although why she doesn't just outright ask her son, I don't know).
It is very sad. The dogs, much as she loves and relies on them, will not be around forever. Her grandchildren will. I think she needs to forge a good relationship with her daughter in law, and thereby with her grandchildren, before it's too late. No one is suggesting she gives up the dogs completely, but some kind of compromise needs to be reached sooner rather than later.