I am sure you have been effective in your research but the drip feeding of information not quite so.
Whilst I fully appreciate that you know nothing or little of Constance and she is your primary focus, there is so much that could have been explained.
You might have thought the will reference and other family members of no consequence but in trying to ascertain information, we often look at the bigger picture. Hence, the findings which you already have in abundance.
But, no matter, we have tried.

As I asked earlier, are you assuming Constance is related through some kind of adoption and this is based on her conversation with your mother?
Did her ‘parents’ leave wills?