Here are a few options, depending on what you're looking for:
If you want a rhyme that emphasizes the country:
* Girl / Swirl: This emphasizes the Swiss flag, which has a red cross on a white background that can look like a swirl.
* Girl / Churn: This might work if you're talking about Swiss chocolate, which is often made with a churning process.
If you want a rhyme that is more general:
* Girl / Pearl: This is a common rhyming pair that might work if you want a more elegant or poetic option.
Ultimately, the best rhyming pair will depend on the context of your writing. Good luck!