STOP DOING THAT... thats what the hated Petco's and their likes do. if its the size of a quarter, id recommend a pinhead cricket or two ONCE or TWICE (tops) a week. 2 honestly would be plenty, but 4 is powerfeeding and that is up to you. feeding her the way you are is just blatant irresponsibility if you ask me. The sling is likely stressed to high hell, and is only eating out of frustration/fear. A DOZEN crix trapped in her enclosure with a 1" (presumably) sling is un imaginable to me... letting crickets run rampant in the cage is a big risk to the life of your sling too... dont say you werent warned.
How big is your enclosure too... just curious.. post some pics for the rest of us to see please