Emphasis mine. Below is the text of section 3 of the 14th amendment. It disqualifies anyone who has previously taken an oath to support the constitution who engages in insurrection or rebellion against the constitution.
Section 3. No person shall be a Senator or Representative in Congress, or elector of President and Vice President, or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any State legislature, or as an executive or judicial officer of any State, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may, by a vote of two-thirds of each House, remove such disability.
It doesn't make sense for her to say that. According to google Robert is 1.84 meters tall and Sarah is 1.7 meters tall. That's 1cm over 6 ft for him and just about 5'7" for her. Why would he stand on an applebox? Does he need to tower over her? Also looking back at the episode he appears about 5 inches taller than her in most shots where they're standing together so he doesn't appear to be using an applebox. I think she is misremembering.