Sarah doesn't miss Scotland, she misses her mum.
If she were to move to Aberdeen/shire to be near her family, she would be constantly moaning about (and here are just a few things off the top of my head).. missing her friends from England, missing the instamums (mrs meldrum barely tolerates her here), missing the beautiful English weather as its so dull and cold here, missing the food and insta worthy cocktail bars, missing all the shops, having to pay £££s for flights to London for "brand work/ PR trips", Rob not getting a decent enough job or being well paid enough to afford the same kind of house and lifestyle they have but in Aberdeen/shire, different tasting sausages... oh and the kids getting picked on for their English accents.