I agree that crawler mice are very small, even for a boa, especially after a few months. I also agree that you should wait a few weeks to let her recuperate from the regurgitation. Usually after one regurge, you should wait 2 weeks before feeding again, but since there has been multiple I'd wait at least 3 weeks. Also, with her next defecation, I'd take the sample to a vet to have it tested for parasites. Good luck.