Good question, although I don't think anyone that high on the SB will be "not submitted" or barred from selection. Leonova was in the the 30s I think, so perhaps she was just too far down the list- they had maxed out their 18 spots with 2 each for Radio, Med, Zag, Panenkova, Sotskova, Konst, Samo, Tuk, and Tsurskaya.
With this result, Serafima vaulted above Tsurskaya, Panenkova, and of course Radionova didn't compete. She actually goes also above Leonova, Konstantinova, Samodurova and Tarusina. Its so crazy that she doesn't go to Nationals (assuming something doesn't change).
Even adding in Kostornaia and Trusova to the senior GP mix, Serafima's SB is high enough that she should get 2, should she want it.