You can take her for a royal stay in one of the many ancient forts of Rajasthan. Afterall, her birth date comes once in 4 years!
You guys can visit Manali and book a stay at GlampEco. They have domes and tents which are cosy and offer a luxe experience with a killer view of the Himalayas!
Neemrana fort is a great place for this occasion
Kerala. Nice, clean, peaceful, beautiful, close to nature and much less polluted😅
Wow! That happens once in 4 yrs. That puts an extra pressure on it being super special