This resolution has been used by some to say that the UDC in general rejected the KKK. It means no such thing. The resolution wasn't adopted by the Virginia Division of the UDC nor the general UDC organization. It remained the resolution of just on chapter in Virginia in the UDC.
The Atlanta Chapter of the UDC was a very prominent chapter of the UDC being the chapter of a major metropolis in the South. They published a pamphlet, "History Atlanta Chapter United Daughters of the Confederacy: 1897-1922," for their 25th anniversary. This was an important pamphlet for them.
In the pamphlet they had advertisements. One of those advertisements was a full page ad for the Ku Klux Klan. The Atlanta Chapter of the UDC didn't think the 1920s KKK was unworthy of being in a very important publication of theirs. This shows at least one very prominent chapter of the UDC hadn't rejected the 1920s KKK.
Not in the KKK ad that they are an organization for "native-born" white people. This is in keeping with the Anglo-Saxonist prejudice of the UDC and the KKK.