title_body: Wine recommendation on the sweet side with 12 to 15% alcohol
upvoted_answer: Most fortified wines such as port, Madeira, (sweet) sherry, Commandaria are both very sweet and are very high in alcohol. Many are in the range of 20% ABV. I would strongly [pun intended] suggest seeing if she enjoys Port or Madeira. My personal favourite strong, sweet wine is Elysium Black muscat. It is so sweet that I commonly have it as dessert in restaurants.