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I am sorry to say that the problem you are describing sounds like your dog has an obstruction in her nasal passages and unfortunately, the most likely cause in a dog her age with her signs is a tumor. The reason that it appears worse may be due to the presence of a blood clot narrowing the passageway even further. Other things can cause the same signs such as a fungal infection, a secondary bacterial infection or an upper respiratory infection can also make the swelling in the nasal passages worse and make it harder to breathe.
If you are interested in pursuing an answer you can talk to your family veterinarian about referral to a specialty center that can perform a CT to visualize her sinuses or you can elect to treat empirically and try a course of antibiotics and a steroid to help decrease inflammation and make her feel better if the physical exam findings are consistent with my suspicions that there is a more serious problem underlying the nose bleed. Do you have any additional questions? Does this address your concerns today?