Getting to say goodbye is such a gift. I did not get this chance with my father who died instantly of a massive heart attack. I would give the world to have had just one day with him before he left us.
Cherish this time you have with your aunt, and ask all the questions you can think of now. You will have fewer regrets later on.
Your writing is beautiful and captures the complicated grief of actively losing someone you love. I am wishing you comfort and acceptance ( for your aunt's sake.) ♥♥♥