Advice for pinning my beloved girl? She is alive in this photo, she has not passed on yet, I promise.

Hey all, my sweet girl Chili (my first invert ever) is likely going to cross over into roach heaven soon. She is very old, and at this point I know there’s only so much we can do to combat aging.

I hope it’s okay to ask here, but does anyone have any good resources on pinning inverts to preserve? I’ve seen a few tutorials but most seem to cover very frail, thin, or delicate bugs. A hissing roach is quite dense and hard, so I feel that I may risk the organic matter decomposing, or have difficulty due to her hard shell.