As someone who sings and is an opera enthusiast, this makes me cringe. At the age of 10, kids really aren't capable of singing opera - they might be able to imitate it, but it's not the same. (She really doesn't sound like she's singing opera btw - the technique is nowhere near) And attempting to sing like that so young and continuing to do so has the potential to blow her voice out and make it hoarse by the age of 25. She really should not be singing like this at her age and should stick to more age appropriate songs.
ETA: Most voice teachers will recommend that their students not attempt to sing opera until their late teens. This is because kids' voices are not mature enough to handle the magnitude of operatic songs. She has talent, but until she's older, she should leave Puccini alone.