Welcome! Thanks for asking your question. My name is***** am a licensed veterinarian and I will be assisting you today. First I need to ask you a few questions so that I can be well informed and give you the best advice.
1- Are you able to look inside her ear canal?
2- Is she walking any different?
1- So she has a head tilt toward the side where she is painful?
2- Any other symptoms?
Please give me a few minutes to type your answer. Thank you.
Friend, the fact that she has a head tilt I am inclined to believe she has an ear infection. When the ear is inflamed it can be very painful, this can explain why she is reluctant to let you look. Less likely she could have a pulled muscle or pinched nerve along the neck. For now, I would recommend not trying to look inside her ear canal, this is going to cause more stress for her and pain. Unfortunately, there is nothing I can recommend for you to give at home or over the counter for pain, most are toxic to dogs and will interfere with certain medications your vet may need to use. For tonight, just keep her comfortable and let her rest. Follow up with family veterinarian in the morning.
My goal is to provide you with excellent service - I hope I've provided the information you were seeking, if you feel you have received anything less, please reply back as I am happy to address follow-up questions. Kindly rate me when you are done.
It is common when a dog is in pain to want to separate themselves, this is why it is best you don't try to look or she is going to run away from you.