Full face helmet

Hello there,

I just got a crf50 for my 6 1/2 years old daughter.
That will be her first ride.

She has been riding with me on my bike before and already own motorcycle gear ( pants, boots, jacket, gloves and helmet)

At this time she own a Vega Laguna Helmet full face who fit her perfectly (as you can replace the liners as she grow.)
and I was wondering if they were any culprit to use it instead of buying an MX helmet and goggles ?

I did bought her a Quadrant chest protector and jersey to complete her outfit.

Thank for any intput.

ps : track will be not be involve ( at list for the moment), it will be mainly for quiet trail riding.

Thanks for the reply

I'm not questionning the integrity of the helmet as I considere Vega Helmet (who is a first price helmet) as good as HJC helmet in the same category.(and like you mentionned, fitting is very important)

My question was more as the actual use on real condition on the trail, aka : vision, heat, dust....