I see a similarity in looks perhaps, in terms of the voice, Molly has a long long way to go before she reaches Leona's level. Leona is a very skilled vocalist and has a huge range and fantastic control, Molly will develop all of this as she gets older and really gets to "know" her own voice.
She has a fantastic voice for her age though. It can only get better. I do think these child singers should wait though. For one thing, child singers rarely make it in the music industry long-term. Plus they have a lack of experience and knowledge. Molly's voice can only get better as long as she continues to practice and perfect her craft, and if she sounds like that now she could sound amazing at around 19/20/21. I don't understand why these child singers are in such a rush, they have their whole life to make it!