3.5 yr old daughter insisted on helping me with dinner prep, so I figured now is a good time as any to teach her the basics…
I’d suggest you first trim the mushroom so that it had a flat bottom to make it more stable and she can practice tucking her fingertips under to avoid the blade. With some practice she can handle unstable veggies but start her on easier things to cut. other than that well done!
Very impressive! If she starts asking more you should consider investing in some of the none metal knives they use on Master Chef Junior…
Very cool! Be careful, she may want to end up becoming a chef! 
Mel, I did trim the side of a mushroom to provide a flat surface!
She wasnt good yet at “bear claw” to hide the finger tips, but she’ll get there.
She seems so proud of herself and helping you out.