I'm afraid nobody here can tell you for sure that your puppy does not have SM, but scratching a few times in the day is fairly normal behaviour and if she is itchy there are other more likely reasons for what you are seeing.
Your puppy must have left its mother very young to be with you, an owner in another country, by the time she is 7 weeks old. A responsible breeder would not sell a puppy under eight weeks old.
She may have missed out on some of the routine care that most good breeders give their young puppies. She could have problems with fleas or other parasites. Has your vet checked her and given you advice on flea treatment and worming?
Cavaliers......Faith, The Ginger Tank and Woody.
Japanese Chins.... Dandy, Benny, Bridgette and Hana.
Remembered with love......... Tommy Tuppence and Fonzi