"Behold the well-nigh universal disregard of the Sabbath commandment. Behold also the daring impiety of those who, while enacting laws to safeguard the supposed sanctity of the first day of the week, at the same time are making laws legalizing the liquor traffic. Wise above that which is written, they attempt to coerce the consciences of men, while lending their sanction to an evil that brutalizes and destroys the beings created in the image of God. It is Satan himself who inspires such legislation. He well knows that the curse of God will rest on those who exalt human enactments above the divine, and he does all in his power to lead men into the broad road that ends in destruction. PK 186.1"
"But he answered and said unto them, Why do ye also transgress the commandment of God by your tradition?"
Both passages address the issue of human traditions or laws being elevated above God's commandments. EGW specifically mentions the Sabbath and laws legalizing the liquor traffic, while Matthew 15:3 is a more general statement about transgressing God's commandments through tradition.
So long have men worshiped human opinions and human institutions that almost the whole world is following after idols. And he who has endeavored to change God's law is using every deceptive artifice to induce men and women to array themselves against God and against the sign by which the righteous are known. But the Lord will not always suffer His law to be broken and despised with impunity. There is a time coming when “the lofty looks of man shall be humbled, and the haughtiness of men shall be bowed down, and the Lord alone shall be exalted in that day.” Isaiah 2:11 . Skepticism may treat the claims of God's law with jest, scoffing, and denial. The spirit of worldliness may contaminate the many and control the few, the cause of God may hold its ground only by great exertion and continual sacrifice, yet in the end the truth will triumph gloriously. PK 186.2 In the closing work of God in the earth, the standard of His law will be again exalted. False religion may prevail, iniquity may …
"The lofty looks of man shall be humbled, and the haughtiness of men shall be bowed down, and the Lord alone shall be exalted in that day."
Ellen White directly references Isaiah 2:11 in this passage.
"Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters. And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication. And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:"
Ellen White directly references Revelation 14:7-10 in this passage.