How old is your female? Is it her first litter?
Rats average 6 to 12 babies per litter if you have a good colony at their pick your females should produce 12 to 15 babies without issues, first may start off with a very small litter, female too old will do the same.
If she is a first timer give her another shot if she does not produce more and you breed for food I would recommend to cull her.
If she is old time to retire.
The key to large litters is to holdback animals from large litters. I only holdback future breeders from litters of 15 babies and up, retirement occur when the production drops below 8 babies.
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