Sorry Mourne, I think that might be wishful thinking

The lady does not look like an ill young woman, she looks like a healthy mature woman. If she had TB she would look more wasted and pale. This lady has all the signs of a face going southwards (not wishing to be rude!

) - slight jowls, heavy brows, lines around mouth etc. Her hands are not the hands of a young woman, either.
Combine all this with the fairly confident dating information of 1915-1920 or so, and I really think that, unfortunately, this is not your grandmother
