Now, you might be wondering “What is the point of all of this!?”
The point, infact, was to compare her height to the canon heights of the Homestuck characters.
Here you can see next to the tallest and shortest Homestuck characters; Equius and Nepeta respectively.
(The website even made JM a baby!)

You can also see I drew a red oval around her head to approximate her head shape. I discovered from the top line to the top of her head is ~20px. This means that JM’s height is 170 pixels. Using the metric of 26in=190px, I determined her to be approx. 23.25 inches.

Okay. The first thing I did is take out an actual tape measurer and measure the yellow thing IRL. It turned out to be ~26”

Next, I determined the height between the floor and approx. height of the yellow thing in pixels to be ~190.