You said..."When I notice her poking around the bottom of the cage and trying to dig, I place a big pot of soil in the enclosure and she has gone in a dug, layed, buried both times without any issue"...I always have a place for my egglaying females to dig in the cage. It avoids the possibility of missing the signs that the female is ready to lay eggs.
You said..."I gutload the crickets with Fluker's gutload which I have recently read is not the best choice for chams because of the corn content"...I've never used it...so I don't know what it contains. I don't like to use commercial gutloads at all. I use a wide variety of greens and veggies.
I dust the insects with a phosphorous-free calcium powder at most feedings because the ratio of calcium to phos. in most insects is not good. Calcium is important not only for bone health but muscles, organs, and more.
If your chameleon still hasn't pooped, IMHO its time to take her to a vet.