The eggs are incubated on perlite so I'm assuming that's what you mean when you say you have e a tote bin ready.
Lettuce is not a good food for her. You can/should gutload,/feed the insects a wide assortment of greens (dandelion greens, kale, collards, endive, escarole, etc) and veggies (carrots, squash, zucchini, sweet potato, sweet red pepper, etc) and a bit of fruit (berries, melon, pears, apples, etc). A veiled can have the same items in addition to insects.
Re eggs...here's how it should go..
Near the time she is going to lay she will drink more, may eat less, will wander the cage looking for a place to lay them, etc she will dig a test hole or even several and pick one which she will dig until she's happy with it. Do not let her see you watching her when shes digging. It may make her abandon the hole. She will turn around butt down usually in the evening and lay the eggs. She will fill in the hole and tamp it down and go back up to the branches hungry and thirsty.
Once that's done you can dig the eggs up being careful not to turn them as you move them to the incubation container. Place them in rows in dents made with your thumb about an inch apart in all directions and put the lid on. Put them somewhere dark where the temperature is about 74F.
