Hi,
Rats are generally weaned at 3 weeks-4 weeks of age. Lucky should be fine. Start feeding a Rat Lab block which is total nutrition for your growing baby. Watch out for too many treats. Rats are very social creatures and will enjoy attention from you. Make sure that she is drinking and once she settles in you can try a small treat for her and she will start to find a comfort level and eat for you. Joan
http://www.rmca.org/Resources/rmcafaq.htm
http://www.quite.co.uk/rats/
Veterinary Technician
I am Vet Tech. for 30+yrs. who works with all animals. I do alot of rescue work with small animals.