I don't think helmets really help at all. They don't in grid-iron nor ice hockey. Everyone has to make a call on when to step away from whatever sport they're in - Fyfe fortunately has a head coach (oops, not noggin coach but boss coach) in JLo who did precisely that.
My nephew got concussed a couple of times playing ice hockey - on his last occasion he was out for two weeks, after 10 days he sat down at the breakfast table, stared at my brother and then abruptly face planted into his bowl of cornflakes. He hung up his skates and consigned his stick into being a garden stake.
I was concussed a few times, the last time was in the late '90s. I was up and about the next day and just kept going - it wasn't until I got older that things....hang on...nup, can't remember what I was going to....nah, forget it.
Nat will be fine I'm sure.