The person is an old schoolfriend who I haven't seen or spoken to in years (no falling out or ill feeling - just a natural drift after I moved to another country). We're also sort of related by marriage (her Mum's sister is married to my Dad's brother).
We were best friends at primary school and I spent a lot of time at her house.
Her Mum has just died from cancer
at quite a young age after only having being diagnosed 9 weeks ago
.
I'm not FB friends with her and she has her FB security set so that only friends can message.
I don't want to appear ghoulish or cheeky but, having great memories of her mum, want to pass on my sympathy and thoughts.
What should I do MN?