Well...it sort of depends on what she would consider a treat.
I don't know the Pandemic status of Scotland, right now. Normally dinner out can cause a smile, but not if it comes with a deadly virus. Ditto taking her to a show (live or movie).
There are some TV shows (some fiction, some documentary) that my bride enjoys. If the same is true of your bride then she might enjoy seeing something along those lines. You'd probably get extra credit if it was something she and the family would enjoy.
Any special foods?
Jewelry is often liked, if it is something she's like. You sort of have to know her taste in jewelry.
But, if she's been dropping any hints then take a hint!
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When diagnosed I bought champagne!
I finally knew why people were strange.