I'm going to a old friends mother funeral how can i best be their for her.?

I found out a friend that i have hardly talked to in seven years mother has died. I asked if their is anything i could do and we should catch if nothing else just to let her i'm their for her. I got a message from her saying when her mums funeral is and i got the impression she wanted me to come. when i asked she said she was really happy for me to come. As far as i know none of our other friends will be their. i don't know her family that much and i don't know what to do when i go their. I will say something if i see her beforehand and i will stay for the service yet should i stay for the wake. I havent been invited to the wake and i don't want to feel like i'm inviting myself. should i just attend the funeral service and send some flowers to the funeral home. Friends say just play it by ear yet i might not have a chance to talk to her after woods my friends mum wasn't religious and they have chosen to have the servicein a garden and it to be non religious. How can i best help my friend.