Her small size and the texture if her coat lead me to believe she is a Lionhead (or cross, possibly with a Netherland Dwarf) that did not get the lion mane.
Agouti is a group of rabbit colours where the hair shaft has two or more colours on it, in your rabbits case she will be dark grey closest to the skin, then yellowish brown and finally black, this is called black agouti AKA Chestnut.
Of course if she is just a baby it will be difficult to determine what breed, or breeds, she is until mature.