No formal lessons. What works at this age:
Now the script is worth starting and a tutor begins to help. At this age children learn Devanagari faster than adults, and they enjoy it — it looks like a code.
Keep sessions short. Thirty minutes twice a week beats an hour once.
Motivation is the whole problem, not ability. A teenager who wants to talk to cousins or understand song lyrics will learn fast; one being made to attend will not, regardless of the teacher.
Replying in English when they speak Hindi. It is the single most common way heritage languages are lost — the child works out that Hindi is optional and stops. Answer in Hindi even when their sentence was broken.
Several of our tutors teach children specifically, from $6 a lesson. Ask for a trial and watch how your child responds — with kids, rapport matters more than qualifications.
Reading an answer is one thing; being corrected while you say it is another. EkGuru tutors teach one to one from $6 a lesson, and most offer a trial.