Swollen nose.

My 9 yo Female Samoyed has a swollen nose - the black part of the nose, on the top. I have noticed this slowly raising for 5 weeks now. There is no pain when touched, no roof of mouth abnormalities or tooth decay. No discharge from the nose. The nose itself is moist but drier than normal. Unfortunately she has always liked to sun bake and although I have tried to stop her, I can't when not around. We live in Australia.
I took her to the vet this week who seemed to have no idea what it was, sending me home with 10 days of antibiotics. Her temperature was normal. I was given mixed messages from them, saying it was of "concern" and I should have xrays if it doesnt improve, but said they would double check with the other vet on site. On return she said xray would show nothing and I should not be concerned ! I am concerned as her mother died just 4 months ago from a nasal tumour at 11yrs old (although presented completely differently ie: single nasal discharge, sneezing, eye deformity). I realise genetics can play a role, however it can also not be associated also. This dog is in every way like her father also, not her mother.
What can I do?