@Lorraine175 You don't seem to have any reviews on your profile, or properties that you're hosting, so I don't see the review you mention. Did they mention it publically, or in private feedback?
If it was private, I would ignore it.
If it was public, I would publically respond to her review, saying something short and professional, like:
"Sorry to hear that you encountered some ants during your stay with us. Our place is located in a tropical environment, and if food messes aren't properly cleaned up, ants move in pretty quickly. The best remedy is to clean up after yourself after meal preparation, which most of our guests do a great job of.