I am new to this forum and really have no idea what I am talking about as far as this subject goes but thought I might try to offer a possible solution... forgive me if it sounds dumb...I am trying
What about trying to fashion a helmet out of aluminum foil- then using it as a template of sorts and cover it with paper mache'? Then you might be able to use velcro to make straps at the neck line to ensure a good fit- It would be light enough but form a sort of shell to protect her tiny head. It might be worth a try. At least you could mold the foil easily enough I would imagine- then just cover it with the strips of news paper- then you could paint it up all cute- just to fit her personality. You could probably cover the papier mache' with a harder coat of something (varnish maybe?) to make it more protective. I would imagine that you need something rather light weight so as not to make her fall over-lol! Hope all of this does nto sound too absurd- maybe worth a try?