Thats a pretty good deal but i would get her switched to rat fuzzies asap. Feeding 8 of anything is way too much imo. The amount of energy she burned constricting and eating each one probably balanced out with the energy she gained from it lol jk. But in all seriousness i wouldnt reccomend doing that again.
Please post some pics, i cant imagine the pastels coming into petco are that good looking but for $50 its a good deal either way.