Thanks for your question. I am a veterinarian and will do my best to help.
This could be something simple, such as a bladder infection that needs antibiotics, or that she has old age incontinence, loss of good bladder sphincter control, and that medications like Proin (made specifically for older female dogs with urinary incontinence) might help.
It can mean something more serious, such as chronic kidney disease, diabetes, or Cushing's disease. If she were mine, I would do a urinalysis to see if there is an infection, treat it if there is one, or try Proin if the urinalysis shows no infection.
If there is sugar in her urine when the urinalysis is done, that is more serious; she might be diabetic and need insulin.
If the urinalysis is normal, and Proin does not help, then I would consider doing blood tests.
Let me know what else I can answer or help with.