It's a 2007. She needs a go-thru just to clean everything out. Odds are the pilot jet is clogged and there's probably gunk in the float bowl.
Regarding parts, with China bikes, many can be found on EBay or Amazon. Type in something broad like "Chinese dirt bike front brake assembly" and stuff like this comes up. You can't necessarily ask for Apollo parts, in specific.
https://www.amazon.com/Cylinder-Cali...s%2C243&sr=8-2
Regarding things like wheel bearings, you just need to dig in and look for a part# on the grease seal or if none available, caliper it out and find it online. Owning a China bike requires a little more digging but it's all out there for cheap.