Could gran still be alive if not found in searches online?

I have been searching for details of my maternal gran who was born in 1926 uk. I have lots of details about her and all her family. I found her brothers and their families, but she's no where. I found the married man who got her pregnant too.

Could it be she's still alive and that's why she's not showing anywhere, or do I have to wait til 100 years us up? This is going sound to awful but I came looking now thinking they would all he dead, and I just get the information without family drama. I don't want my mum upset.

I have done a ancestry dna test and results due end of March. My grans, brothers family, one of them does have a tree with a dna test of their own. It's going to be a shock to them, they dont know my mum exists so I can hardly see them giving me info (we not after a family connection).