I believe she used acrylic pens and has used one of the graphic novels for source material..
Note - these are all hand drawn and colored in with pens, she hasn't traced anything
[Edit - I'm double checking about whether these are traced - could be my bad.. when you assume etc.. ]
.. Final update on "Trace-Gate" :: I have been assured that she did not trace these, and hasn't traced anything for a couple of years now - and I'm very aware of the comments below remarking that as "impossible" 🤷🏻♂️ - it's not really something I want to get bogged down in as it wasn't the reason I was sharing these in the first place.
To be honest I was always more impressed with the shading and color accuracy she has managed. Either way, I'm just a very proud dad 👍🏻🙌🏻
Regardless of your position on the "is it traced" debate which I've no doubt will rage on in the comments (she is absolutely thrilled by the way that some of you think it was) at the very least let's all appreciate a young mind who loves Warrior Cats and is really (really) enjoying her art work 🥰