It's possible it really was eating only collards. I found eggs on the outside of the greens when I harvested and cut them up today. But the tomatoes lurk just one bed over (We have four raised garden beds!). For now, Electra is only eating the hornworms we get from Mulberry Farms !
I fed my dragons hornworms from my garden during a whole summer before. Tomato plants were ruined, but the dragons were happy, healthy, and fat. One shouldn't make a difference, they are not like deadly fireflies.
I buy from a bug company now for their hornfeeders.