also.. by slowing the brix down by placing them in the fridge for 10 mins or so they will hop away much slower.
or feeding on the floor of your room where the crickets cant get out of sight so quick is an idea.
or using tongs as already mentioned, hand feeding is cool, you can always place them down after the beardie has clocked them and began to line up for a snatch.
also excersise will help her go to the loo whether she is just not ready to go yet or blocked up.
so a bath, a run around, soem nice wet leafy veg or whatnot and maybe even a light belly massage and she may go to the loo soon, hopefully.
But no mealies until things are normal.
And then..always less often than crickets, less of an issue if she is active, pooping, eating greens, pooping etc.. then a couple days of mainly mealies wont do any harm, but if all is not normal then best to avoid and defo if theres toilet issues.
good luck