In regard to admission in different classes for CBSE pattern for classes of LKG is 3+ years but according to the latest guide line of RTE, there has been some minor adjustment with the revision of the existing age with the upward increase of four months. This would be computed on the basis of completion 3 years 10 months on the 1 st June of the year when the admission is to sought. In respect to admission for UKG and Class 1, it would be 4 years 10 months and 5 years 10 months respectively.
However, in your case when there is shortage by four months in order to eligible for admission, you should not be panic for such a minor shortfall of her age. The age criteria differs from schools to schools to some extent. If some school refuses for her admission on that ground, the other school would entertain her for admission. You could discuss the same with the school - authority.
Moreover, there is always a possibility of minor changes in respect of ages from time to time and when she reaches to class ten, a new circular may come up making her entitled for appearing class ten Board - examination.