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Just to check - you are not keeping them together are you?
Syrians are strictly solitary. A 3rd litter would not do her any good and may shorten her lifespan.
Ensure her male pups are removed a 4 weeks because they can and will mate with the mother at this age.
You do need to ensure there is care for the pups when you are away with someone responsible and also a vet on hand in case something goes wrong and they need attention. I would suggest this is her last litter as so close to the previous is a great strain on the mother.