She stood behind Fred and George and the rest of the Weasleys. Even though she didn't know Lily, Katie knew she wanted to be there for the twins and the rest of their family. Standing there, she was reminded of Fred's funeral; how devastated she had been while trying to be strong for George. Of course, this time there were more Weasley around and it was easier for her to remain strong.
As the service came to an end, she hugged both twins tightly and promised to swing by the Leaky later that day to check on them. As much as she would have liked to stay with them all day, Katie knew better than to intrude on their time with their family. After they all left, she apparated to the cemetery in Ottery St. Catchpole so she could see someone she missed dearly.