Caitlin had been largely responsible for establishing a well in Mahanga that services about 10,000 people, Lydia said.
She described her friend as "brave and beautiful".
"I was so blessed to be able to know her."
Mr Crosby said three Bethlehem College students remained in hospital in Kenya, two of them seriously injured.
Some of them were unaware their friends were dead, he said.
The bodies of the dead were expected to be home soon.
"I think they'll be back fairly quickly and that is already underway," Mr Crosby said.
A vigil was organised at Bethlehem College chapel this morning by Lydia and another of Caitlin's friends, Matt Smallberger, giving those who knew Caitlin the opportunity to write in a condolence book and pray.
About 150 people had registered to come along on Facebook.
Locals had also held their own service for the dead at the Kenyan hospital.