Good Morning and welcome. I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
I am so sorry to hear about this situation...I know this is very frustrating but there are ways past this with consistency and persitence.
Athina is still very young and she does not know that she is biting too hard...she thinks she is playing. The best thing you can do is to first, purchase a DAP Collar at the pet store. This is a canine pheromone that acts as a calming agent and will help calm your gal down. Next, carry a coke can with pennies in it and when she does this . shake the can loudly which will get his attention and say a strong NO!! she will eventually get the idea that you are the "Alpha Dog" and she will stop this bad behavior. You cannot tolerate ANY biting even if she is playing.....be consistent and she will get the idea.
If Athina is still doing this, have your vet examine her and then prescribe an anti anxiety medication such as Clomicalm which will be very effective at calming her down so she can learn the correct way to behave.
This LINK may help. Also, this LINK has good information.
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please Reply so I can clarify for you
Sincerely, XXXXX XXXXX