I feel like we don't really see Charles and Camilla interacting that much with the extended royal family, so I think it's hard to judge a lot of those relationships. I certainly don't get the impression that Camilla and Sophie are particularly close at all, but on the occasions that we have seen them together, they seem to get along perfectly fine. That said, I think Sophie's quite a naturally outgoing person, and she seems to be getting along with whoever she's interacting with (admittedly, I know less about Camilla, but I'm certainly under the impression that she's someone who's easy to get along with, too.)
The only time I ever really remember reading anything about Sophie and Camilla's relationship was around the time Charles and Camilla were getting married. I think some of the tabloids said some vague stuff about Sophie not wanting anything to do with Camilla and resenting the fact that she would have to curtsy to Camilla, etc. It seemed a pretty clear attempt by the tabloids to stir up a cat fight that never actually existed.
The only time I ever really remember reading anything about Sophie and Camilla's relationship was around the time Charles and Camilla were getting married. I think some of the tabloids said some vague stuff about Sophie not wanting anything to do with Camilla and resenting the fact that she would have to curtsy to Camilla, etc. It seemed a pretty clear attempt by the tabloids to stir up a cat fight that never actually existed.