Let's take responsibility
I hope your daughter is OK, and that this experience hasn't tarnished your daughters, or your, enjoyment of our sport. Whilst it's not something I do on principle, I've had people on the back of my trikes heaps of times in the past, so I won't be throwing any stones.
Regarding your original question, not sure what you mean buy brush guards, but if you mean heel guards like you find on modern quads, I find those things worth their weight in gold.
I grew up riding three wheelers, and I own a few and still love to ride them, but after years of racing quads with heel guards, I feel a bit nude on the trikes because they have no heel guards. When I raced, both the nerf bar nets, and the heel guards saved me from serious injury countless times.
I've been accumulating parts to do a trike conversion on a WR450f and that trike, when built, will have the YFZ450 pegs and heel guards without doubt. Will I be putting heel guards on my original three wheelers? Probably not, but if done right I see no issue in it.
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My toys 85 KXT250A2, 85 ATC250R, 85 Tri-z 250, 06 LT-R450, 04 YFZ450S, 07 125 typhoon x 3, 06 FPV GT.