If worried, replace, no sense riding around waiting on a flat. 11k and she should be getting somewhat close to replacement and based on some rider reports you should be riding on the rims
With that kind of mileage I am not sure a plug would hold all that long, if you really want to keep the tire get er patched.
Me personally? Based soley on the mileage I'd replace her. A pic sure would help give a more informed opinion.