[violets]

As far as I recall, the "installation" is when you receive your charter. Although if I'm not right much more well informed posters than myelf will give you the full story. These women who regularly post here are amazing!
As for your wanting to puruse Delta Gamma membership, congratulations! It is an amazing organization. It sounds as if DG is a big part of your mother's life, I hope all works out and you and your mother can be sisters as well as mother and daughter.
Best wishes,
violets