How can she

I've just had a major anagnorisis. 

My best friend doesn't feel the empathy that other people feel because she has never lost a loved one.

Recently, another friend almost as reserved and cynical as my best, has become somewhat more, compassionate and kinder. We get on more. She lost her great gran not so long ago.

She will wake up to the real world when the worst happens.

You never realize something until it's too late.