when you hold them they should feel like...a tube of muscle haha. they should feel pretty firm in your hands.
I don't want to throw another suggestion at you as I can see you are getting overwhelmed here but you also might want to look into getting a sterelite tub for her down the line rather than a glass tank. I know you just spent the cash on all the stuff but the reason I suggest a 10 dollar plastic tub instead is the ease of humidity and heat requirements compared to a screen top tank.