"Jehoram the son of Ahab was still reigning in the kingdom of Israel when his nephew, Ahaziah, came to the throne of Judah. Ahaziah ruled only one year, and during this time, influenced by his mother, Athaliah, “his counselor to do wickedly,” “he walked in the way of the house of Ahab, and did evil in the sight of the Lord.” 2 Chronicles 22:3, 4 ; 2 Kings 8:27 . Jezebel, his grandmother, was still living, and he allied himself boldly with Jehoram of Israel, his uncle. PK 214.1"
"And he walked in the way of the house of Ahab, and did evil in the sight of the Lord, as did the house of Ahab: for he was the son in law of the house of Ahab."
EGW directly references 2 Kings 8:27, accurately reflecting the verse's content regarding Ahaziah walking in the ways of Ahab.
"He also walked in the ways of the house of Ahab: for his mother was his counsellor to do wickedly."
EGW directly quotes and references 2 Chronicles 22:3, accurately reflecting the verse's content regarding Athaliah's influence on Ahaziah.
"In anointing Jehu, the messenger of Elisha declared, “I have anointed thee king over the people of the Lord, even over Israel.” And then he solemnly charged Jehu with a special commission from heaven. “Thou shalt smite the house of Ahab thy master,” the Lord declared through His messenger, “that I may avenge the blood of My servants the prophets, and the blood of all the servants of the Lord, at the hand of Jezebel. For the whole house of Ahab shall perish.” 2 Kings 9:6-8 . PK 214.3"
"And he arose, and went into the house; and he poured the oil on his head, and said unto him, Thus saith the Lord God of Israel, I have anointed thee king over the people of the Lord, even over Israel. And thou shalt smite the house of Ahab thy master, that I may avenge the blood of my servants the prophets, and the blood of all the servants of the Lord, at the hand of Jezebel. For the whole house of Ahab shall perish: and I will cut off from Ahab him that pisseth against the wall, and him that is shut up and left in Israel:"
Ellen White directly references 2 Kings 9:6-8 in this passage.