Try shrinking

Sophie: "Say... While being a giantess is cool-cool and all, I can't help but wonder if this works two ways."

You concentrate once more, wanting to become a miniscule, microscopic spec of dust. Or perhaps not quite as small - you don't want to repeat the age-old tropes of having to fight off every damn insect and spider in your lawn. At first you settle for 4 inches tall.

At four inches, the grass on your lawn reaches your waist, despite having mowed it days ago. Your body retains its proportions completely, but, despite the nasty and unfun square-cube-law, you don't feel the slightest bit cold. You can still breathe regular air, so your cells must still retain their previous size. However, despite obviously now having less cells in your body, your thoughts are not hampered and you don't feel a tingle in your extremities that would follow if your veins reduced in size.

Your best guess? It's magic.

Sophie: "Now basic bitch insects won't try to eat me, hopefully... but what if I run into a cat? An alleycat would gore a tiny squealing animal like myself. I better take this to extremes anyways, straight into microbial."

Your shrink further down. Seeing the ground approach endlessly almost gives you vertigo. You have to stop multiple times to regain your bearings, but eventually manage to reach sizes where the side of a grain of sand looks like a magnificent plain.

At these kinds of sizes, even seeing becomes difficult. The leaves of the old oak tree in your backyard are relativistically as far away as the Moon would normally be. Dazed by the magnitude of everything, you walk onto the edge of the sand grain on which you're standing, seeing to your horror that there appear to be miles-deep gorges between each grain. You're not sure which laws of nature are lopsided in regards to your shrinkage, but you don't want to test whether or not you'd die from falling mere fractions of millimeters.

Dizzily, you shake your head.

Sophie: "Geez, this is weird!"

You grow a bit more just to reassure yourself that you still have control over the situation.

Then, to sate your curiosity, you begin to shrink even more, and more, until you begin to see individual molecules in the crystalline surface. It really feels like things of this size were never really intended to be looked at by macro-level objects - they look absolutely alien, and it rattles your brain how you are - supposedly at least - composed of the same material.