While she's so wee I wouldn't worry unduly at this point - just be aware. Both of mine yelped regularly as pups at random things - most especially being lifted 'wrong' and this stopped as they matured. However, my two have NOT been scanned, so this may be an SM symptom. On the other hand, Holly is nearly 6 and Amber almost 3 so if they are SM dogs (realistically, they probably are) they are either asymptomatic or as near as makes no difference.
Basically, I'm trying to say: train everyone you know on the correct way to lift a pup (even a verbal cue can help the pup prepare itself for liftoff; I always held the pup for a second before actually lifting it up and that seemed to stop the squeaks and yelps...). Read up on SM - but most importantly, enjoy your pup. Statistically I believe the chances of SM showing up on such a young pup are small.
Holly - 7years
Amber- 3 years