nope i don't feed crickets to my guys i feed locusts as their part of their stable diet..along with butter worms, they HATE wax worms with a passion lol, silkworms as you already know and thinking of adding dubia's, phoenix worms etc..personally i find crickets hide ALOT and feel sorry for my poor guys..
You can buy Dubias in a range of sizes - I bought tiny ones to start with to get me used to them! They are a bit like woodlice when that small, lol! Phoenix worms can be fed at her age, although not all chams like them! Just remember not to feed anything that has a body width greater than the distance between her eyes to avoid her choking. Soft bodied feeders such as butterworms, waxies and silkies can be fed a little bit bigger than the 'harder' shelled/bodied feeders.