Salaam Alaik Sister - I currently attend a tajweed class, however the problem will be that at that centre they do not allow children and I understand that won't work with you.
I also am doing tahfith, i don't go to a centre for that but i recite to a friend. Perhaps I can help you out with that since I have time - I sure am no expert on tajweed/quraan but I sure do know the feeling of slacking and putting it off when you don't have incentive to do it.
Drop me an email at [email protected] - I'd love to help you out with this.
Fi Amaanillah