Short answer
It's a mild risk. Limes are acidic and the peel oils can cause drooling, vomiting, or diarrhea, especially in a small kitten. Watch her closely for the next few hours for any of those signs. If she starts drooling or seems unwell, call your vet for advice.
Lime — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
Same as lemon — acidic, and the peel oils cause drooling, vomiting and diarrhoea.
The full verdict, portion guidance and serving notes are collected on the Lime food facts page.