Hi Gustin
Beauty is not a static thing.
Parents will think their new baby beautiful, but if they were to keep that interpretation of beauty, then they would not think the person that the baby becomes such a thing of beauty. So their understanding of their child's beauty will evolve, as he or she begins to develop, physically and mentally.
When the child becomes an adult, the parents will still think them beautiful, but will retain the memory of other times when they were beautiful too.
Beauty is not a single thing.
True beauty comes from within. Someone who is considered to have real physical beauty may be an ugly person when they are asked to be kind, compassionate or loving. You have to consider a person holistically to be able to see beauty.
Love
Love is too often used in the wrong context these days. It has become degraded currency.
True love for someone is something that evolves with time, taking into account things that happen through life.
Unconditional Love
There are two periods in life when I think that love becomes unconditional, and that is from both sides.
The first is the baby. The baby loves its parents unconditionally, and trusts them with its life. The baby may not know the parents are, in fact, its mother and father; how can it? But it gives unconditional love. The parents give unconditional love to their child, though they know nothing about the child except that it comes from their own love.
The second is the person with dementia. This is in many respects like the baby, above. The person with dementia has to trust their carer with their life. They may not have the words to say it, but I'm convinced that love endures for them - it is all there inside, but the language changes from words to expressions, nuances of expressions. The person may no longer recognise their parents, spouse, children, and the love the person can give will be changed by the illness, but I'm convinced it is there. The relative or carer gives unconditional love to their relative/friend although they may be shouted at or punched by them; this is the dementia, not the person though it can be difficult to separate the two!
Your mother will continue to live in beauty for as long as you remember how she was throughout the time you have known her and accept her as she is - and will be - now.
For your own part, now would be a good time to gather all the pictures you can find of your mother and pull them together into the story of her life. This is good because firstly, you can re-live those memories with her at the moment, and it may help her. Secondly, it will help you put her life into context. When a person changes with dementia, one can forget that they once laughed at shared experiences. Never forget that they loved their life. The dementia is a temporary state. It may last quite a while, but it does not define their life in the round.
But the way you respond to Rose's changed circumstances could change YOUR life; only time will tell.
So sorry to see your beautifully put message.
Best wishes