You offered again too soon. Don't offer the rat again for another week. Offering food daily after refusal will just lead to more refusals.
I WAS about to warn you about getting to attached to the rat over the next week. If you decide to keep him/her as a pet - be sure to get it a same sexed buddy - rats do better in pairs.
I think it is a mortal sin for a snake owner to get attached to rats