It could just be stress, it's not uncommon for hens to cease laying when moved to a new environment. Check her over, make sure her abdomen feels normal and she is not underweight, to rule out some common health issues. It's also possible that she is not 11 months old - people do lie sometimes. I have a distinct memory from my childhood of being offered free laying hens by some acquaintances of our family. We were told they were young, hardy, and laid well. We decided to take them. The birds we got were not the birds advertised. These were stewing fowl, probably 6 or 7 years old, all gnarled feet and scarred combs. They laid 1-2 eggs per week.
If it is stress, she should lay within the next week or so. If she has a health issue, she may not lay at all, or lay abnormal eggs. If it is old age, she should lay a couple times a week.