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going by her age, providing you are not seeing any seizure activity I would look into Canine cognitive Dysfunction. This is similar to human dementia where the dog begins to display odd behaviors, forgetful behaviors. Over time you may notice more oddities. Some dogs will even forget they they potty outside and end up soiling the house.
I am going to direct you to a link that goes over this. What I would do is video tape the behavior so you can show your Vet. Your Vet is going to ask you several questions to determine if this is CCD . There is medication for this that your vet can prescribe.
Seizure activity , such as focal seizures can also show a change in behavior so you will also want to discuss that with your Vet.