Don't you think it is a bit dodgy that your response to the idea that she might know this stuff was to be sarcastic about the possibility, though?
No, for a simple reason: Sensi quoted the Titius-Bode law which I had never heard of, but within two minutes of googling it, I found the following text so my working assumption was that she didn't really know about this. And I didn't see why I should let an inaccurate statement go without challenging it, as women on MN also do.
When originally published, the law was approximately satisfied by all the known planets—Mercury through Saturn—with a gap between the fourth and fifth planets. It was regarded as interesting, but of no great importance until the discovery of Uranus in 1781, which happens to fit into the series. Based on this discovery, Bode urged a search for a fifth planet. Ceres, the largest object in the asteroid belt, was found at Bode's predicted position in 1801. Bode's law was then widely accepted until Neptune was discovered in 1846 and found not to satisfy the law. Simultaneously, the large number of asteroids discovered in the belt removed Ceres from the list of planets. Bode's law was discussed by the astronomer and logician Charles Sanders Peirce in 1898 as an example of fallacious reasoning.[4]
The discovery of Pluto in 1930 confounded the issue still further. Although nowhere near its position as predicted by Bode's law, it was roughly at the position the law had predicted for Neptune. However, the subsequent discovery of the Kuiper belt, and in particular of the object Eris, which is more massive than Pluto yet does not fit Bode's law, further discredited the formula.