She divorced her 2nd husband as DH and I moved house about 8 years ago and as she could chose to live anywhere really she followed us. Not on our doorstep but near by.
She bought what she could in a good area but with limited funds and as house prices haven't increased at all in the 8 years (it's quite a unique property) now we are looking to move she is wanting to follow and basically looking to DH to solve her accommodation problems for her.
So far it's been suggested she moves in with us 
DH takes out an additional mortgage to increase her buying power
We build her something as a granny flat type arrangement
My suggestion that she sells up and rent from her not unsubstantial pension was met with she cannot afford it and yet any other single person would be expected to manage on £1000 a month without any government top ups, so I don't understand why it's out of the question for her.
AIBU to think basically she's not our dependent and since nobody has asked her to relocate with us if she cannot afford to move then she shouldn't ?