Mother .. lost to Alzheimer's Disease

My dear mother died in January this year, at 93 (just two months before Rich) ... she had lived with Rich and I for 18 years but finally we couldn't handle her anymore and she moved into an adult foster home near my sister in California.
We first noticed the onset of Alzheimer's Disease when she was about 83 but we thought it was just forgetfulness ... the monster wouldn't let go of her until it finally won.
I wrote an ode to mother one day when I was feeling particularly low ... here it is:

Mother where are you?
You’re in there somewhere … the loving parent, the laugh, the smile, the compassion … they’re hiding behind the most cruel of inflictions - perhaps never to be seen again.
Why have you been robbed of who you are, why have I been robbed of my dearest mother? This devastating disease has taken you from me … if only I could find a way to reach you. I cry, my heart aches with heaviness, sadness overtakes me, despair is fighting to take over but I have to remain strong, you taught me that. I miss you so. You’re here but you’re not … we talk, but do you know who I really am? Do you know what I mean to you .. what you mean to me? The lump in my throat that comes when my eyes well up with tears is here with me.
You epitomized the word “mother” in every sense … you were the best! You were my comforter when I had nightmares .. you’d climb in bed and comfort me until I fell asleep; when I was sick you were my nurse .. always checking on me, giving me special food and attention when I needed it the most; when I was upset you were my counselor .. the voice of reason and common sense.
Why has God allowed this cruel and indiscriminate misery to overtake you? You’re the last person who should be punished … the first who should be rewarded.
Oh Mother, where are you?