Originally Posted by riccil0ve
Will a dapple gray eventually/usually fade into just gray like the OP's horse?
Yes. All grays end up entirely white or fleabitten. The age a horse ends up dappled (if it even dapples) and the length of its dappled stage varies from horse to horse. I boarded with a 12 year old who was still in the middle of his dapple stage.
OP, your mare was probably born chestnut and is chestnut under the gray if she has some red spots and looked like a red roan when she was younger. She probably looked like a red roan because of the graying process.