Who should receive graduation announcements?

My daughter who is graduating from college in August is the youngest grand daughter in my family. Consequently, all of her cousins are now adults living on there own. She intends to send graduation announcememts to my sisters and brother--obviously her aunts and uncle, but is it appropriate to send announcements to her adult cousins? And if so which ones? When they were all graduating my children were still young and at home. They all live at least 1000 miles away so visits have been less than annually and when visiting not all cousins are around to see. Most are 10 plus years older...all have graduated from college so they know her achievement. This sounds so stupid. But I'm really stumped on what advice to give her.Can you write 'no gifts necessary'? Grasping for graduation grace....Grateful Mom