Yup. Mum has mixed Vascular and Alzheimer's. Personally I think the balance tips more towards the Vascular Dementia for two reasons:
Her symptoms have got far worse following a couple of TIAs and mini strokes.
She was prescribed Memantine because they thought it might help the Alzheimer's but it seems to have made no difference at all, however the doctors advise against taking her off it after all this time in case she deteriorates.
Mum has always been a lovely friendly person, everyone loved her and she would always help anyone, whether she knew them or not. Even now her concern is for my Dad and his condition, for my brother and how hard he works, for me that she and my Dad think I do too much for them (I really don't). First and foremost she was and is a Wife and Mother.
She is totally non-aggressive, usually accepts things and doesn't argue with anything and complies with what we tell her is best. I know from reading this forum that we are incredibly lucky in that. So far, anyway.
On the negative side she has no short term memory whatsoever, has largely retreated from social interaction, gets tearful most mornings (this has been controlled quite well by Mirtazapine), has lost much of her vocabulary so cannot hold a conversation anymore, rarely washes without prompting and seems happy to just sit watching as others prepare meals, drinks etc (that is TOTALLY opposite to how she has always been).
But there is no template for Dementia, mixed or otherwise. Your Mum could have a totally different progression.
You will however find this place incredibly supportive and a mine of really useful information. Stay strong. xxx