ROOKWOOD artist cipher mystery

Just purchased a 5 inch Rookwood vase shape 809. Rookwood symbol with 12 flames (assuming dating from 1898) Artist cipher appears to be initials "A.D.S." Think their name is Adeliza Drake Sehon. She wasn't at Rookwood past 1902

Finisher's mark appears to be at the 10 o'clock position relative to the Rookwood symbol. Trying to find out more about the artist. .

Below the shape number is an impressed triangle. What does the triangle mark mean?

Neck appears to be repaired where it joins body..

Can anyone add to this information?

Thanks for all info!

Mark