roommate fed snake rethawed mouse

my roommate is feeding my snake while i am out of town, and she attempted to feed him 3 days ago but it was too close to his shed. yesterday night he shed so he was hungry today. but she told me that she reused the pinkie mouse she had thawed for the first feeding, and told me that she refroze it within a half hour she had thawed it in warm water. i’m rly unhappy that she has done this and have let her know that that’s rly not safe. can someone tell me if i should be worried or not? i’m stressed (

No reason to worry. As long as the feeder was froze soon after thawing the first time.
I've done it before when feeder supply was low and I didn't want to toss what I did have.