I think that there is a sense of urgency that comes from the approaching holiday. It would be terrible if your friend would need something urgent on Christmas. What you are describing does not sound dire to me. She's eating and you say that she is not in pain.
You may want to make a vet appt. to see if there are any comfort measures that you can use given her age and for reassurance.
I put my Feldog down on Dec. 22nd but she had taken a turn for the worse. When I went to tend to her paw--which was infected-- she cried and whimpered. She had never, ever done that and so I knew it as time.