Sisters miscarriage

My sister has just found out she’s had a miscarriage today, I feel so awful for her! Anyone got any tips/advice on how to be there for her? Like I’ve never experienced it and I’ve got a little boy myself! I’m meeting her tomorrow so I can be her shoulder to cry on but I don’t know how to help her if you know what I mean, I feel so helpless☹️ my hearts absolutely broken for her as she was so excited to have a little family of her own after seeing me grow my little family...

EDIT: I don’t have a babysitter for my son and she knows that, thanks for the little advice