motoro refusing food

my new motoro has suddenly decided to refuse its food. yesterday i feed her silversides she just chewed them up and spit them out ? prior feeding was raw shrimp. same thing chewed it up and spit them out. prior feeding raw shrimp same thing. i know from the past feedings raw shrimp is not her favorite,but she has eaten it in the past. i am going to purchase night crawlers today i have a good felling she will not refuse the worms. water quality is perfect. she has good weight still but this concerns me. not sure if this is a bad sign or just a fasting fish? i have not experience this before all my motoros once acclimated for a couple weeks they seem to be eating machines.

thank you Colin got trout worms ate like 15. the thing that i have never seen is the fact that she chewed up her food and spit it out. i have had rays not eat but not chew it up then spit the food out. it's all good now