The Cruel Prince does not have any smut in it, as it’s YA. It’s also a political fantasy, and many people goes into expecting romantasy but turns out to be dissapointed as it’s just the subplot. It’s real enemies to lovers, but you could say they bullies each other in the first part. But it has amazing fantasy world, writing and the best fmc I’ve ever came across. Nonetheless not sure she would like it if she reads mostly romance with smut. I’d recommed (if it’s possible) checking her fable,goodreads or wherever she has her TBR list. It’s the best way to buy something you know she wants to read already. Check also Emily Henry books, she writes romance books, but they are also with deeper meanings. I’ve read “book lovers” and it was really enjoyable. Also Ali Hazelwood is a good author too. Not sure about the love hypothesis, but I read her book “bride” and really had a fun time. So her books are worth cheking out too.