This matter could be asked about upon returning. Logically, Divine God Beasts of the same clan shouldn't be forming factions; that behavior suited swarms of flies and packs of dogs more.
Divine God Beasts had fewer concerns, especially the Four Spirits! Among their own kin, they were absolutely trustworthy.
In the scene, Meng Xiao struck down with a roar, scolding, "From the moment you chose the surname Ji instead of Meng, I knew you were a traitor of the Dragon Clan! You indeed refused to become a True Dragon even after passing the Heavenly Tribulation! And now you stand by this person's side!"
He struck at Ji Feixue again and again, each blow heavy with hate, wishing he could tear her apart with his bare hands.
In the scene, Ji Feixue looked to be only at the level of Stepping Sky Four-fold; aside from using the Dragon Scales from her mother to defend, she had no other means to contend with a Divine God Dragon of Opening Heaven Six-fold.