Milo went deaf for the last four or five years of his life. We used hand signals a lot, which he got the hang of. Careful never to come up behind him and startle,him, tried to approach from the front. Also kept him on a long lead, as worried he may get into trouble with a car or something and not hear us call him. I actually think it was more stressful for us than him. I don't know of your dog has been deaf from birth, but if so she will have known nothing different. Cockers are bright, she'll pick up hand signals quickly. Patience and consistency. Good luck 🤞😄