Smoothing ruffled feathers. Any ideas?

Grandma and granddaughter are not communicating well so there are some bad feelings between them. Granddaughter is the caregiver for grandpa, grandma is happy with care, but doesn't like the restrictions to visitation the granddaughter has made. the granddaughter is not happy the grandma won't watch grandpa for an hour or two on occasion. Granddaughter is managing grandpa's finances and grandma wants more of grandpa's income. The grandma lives in her own home while the granddaughter has taken grandpa to live with her as the caregiving is easier with him right there. How can both granddaughter and grandma be approached to close the riff between them?