Translation is more than just converting words—it's about capturing the essence. '恋とはどんなものかしら' carries a delicate, introspective nuance that's quintessentially Japanese. In English, I'd render it as 'I wonder what love really is' to preserve that contemplative tone.
The phrase loses some poetic rhythm in translation, but adding 'really' helps emphasize the speaker's genuine curiosity. I've seen similar lines in 'Your Name' subtitled as 'What is this feeling?', which works contextually but feels more immediate. The original Japanese version implies a slower, more philosophical pondering—something we often lose in English adaptations.