3 weeks isn't much time at all and the 30g weight loss could almost be from a single bowel movement. heh I wouldn't worry about bringing your snake with you for 3 days. You're right in thinking that the stress would probably out-weigh any benefits of having her closer to you.
As far as re-freezing rodents. I never take the chance. Once it's been thawed once, I just toss it. I'll also usually leave the prey item in with the ball python over night. Some of my best eater will only eat when I leave it in there for them. Other snakes I don't bother with. I haven't found many animals that pickup this behavior. Either they'll do it regularly or not at all. Definitely something to try to see if you can get away with it. I just have to remember to remove the rodent first thing in the morning.
Continue to monitor weight loss, but you probably have nothing to worry about unless she continues to lose weight at that pace.
Good luck and hope her fast ends soon!
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