mewho, maybe she misses your parents as well, or maybe she is wistful about the losses in your lives. She might have been remembering the past and the good times as well as what she has lost and the losses you suffered as well. You can ask her.
Whether you have welcomed her with open arms or told her you appreciate her, if you didn’t really mean it, she might have known. So if she is the only living parent left, and the only grandparent left for your grandchildren how much more precious is this woman who you call “shviger”? No matter how annoying she gets, no matter how uncomfortable you feel, what does this woman deserve from her children and grandchildren when she is all alone? What does she really mean to you? Is there anything that you need to do to change your attitude about her?
Your original post was about getting rid of her and getting YOUR life back to normal. Your life may never get back to what you consider normal. THIS might be your normal for a while until it gets even more complicated and invasive. And as your shviger gets older and possibly has medical and emotional issues it is not her that will be able to change and be in control of her attitude or emotions or even actions. YOU are the one that will have to change and learn how to deal with what is happening to her, how to deal with her needs, wants and wishes while maintaining your home, family and hopefully your sanity.
You might need the help of a therapist that you can vent to, a good friend that will lend you an ear to chew on, or a very generous Rebetzin who can help build your strength and emunah. Whatever happens, Hatzlocha, we are rooting for you.