I can only imagine what you've been through. What an awful situation but yes I would leave her her share, maybe as someone said talk to your solicitor as she could perhaps have it ( if still drinking ) on rent or monthly and ( if in recovery ) she will be delighted to have been included.
I believe in miracles and do know some recovering alcohols who are nicer and wiser than non alcoholics. Or talk to an AA group and see what they recommend perhaps x
Elderly fellow gran has become loudly racist
When will this wind ever stop?!