Hi ,
Check out the following link. You can view the NCERT text book online for hindi.
NCERT Textbooks
Hope this helps.
May be it would be wise to first start training your daughter on a lower grade
level now itself(since you said she doesn't understand hindi) and gradually move on to higher grades.Don't worry she'll be able to catch up soon.
On a different note, Some schools give kids an option to select 'Special English' instead of native_language[tamil/malayalam], but usually hindi will be marked as mandatory.