"But what is the “image to the beast”? and how is it to be formed? The image is made by the two-horned beast, and is an image to the first beast. It is also called an image of the beast. Then to learn what the image is like and how it is to be formed we must study the characteristics of the beast itself—the papacy. GC 443.1"
"And deceiveth them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, which had the wound by a sword, and did live."
EGW directly quotes and interprets Revelation 13:14, focusing on the 'image of the beast'.
"When the early church became corrupted by departing from the simplicity of the gospel and accepting heathen rites and customs, she lost the Spirit and power of God; and in order to control the consciences of the people, she sought the support of the secular power. The result was the papacy, a church that controlled the power of the state and employed it to further her own ends, especially for the punishment of “heresy.” In order for the United States to form an image of the beast, the religious power must so control the civil government that the authority of the state will also be employed by the church to accomplish her own ends. GC 443.2"
"I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel: Which is not another; but there be some that trouble you, and would pervert the gospel of Christ."
Both passages discuss the corruption of the church and its reliance on secular power, although Galatians 1:6-7 is a more general warning against perverting the gospel, while the EGW passage is a specific interpretation of historical events.
"It was apostasy that led the early church to seek the aid of the civil government, and this prepared the way for the development of the papacy—the beast. Said Paul: “There” shall “come a falling away, ... and that man of sin be revealed.” 2 Thessalonians 2:3 . So apostasy in the church will prepare the way for the image to the beast. GC 443.4"
"Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;"
Ellen White directly references 2 Thessalonians 2:3 in this passage.