Junior Halal ISA

Hi,
Just join the forum as I was desperately looking for halal ISA options with my limited knowledge,I’ve searched few topics but would appreciate if I receive guidance through my post …
My child is 15 years now need to open an ISA as I’m receiving some funds for them when I was reading about ISA it says that capital can be at risk? that worries me as what I’ll be receiving is inheritance for an orphan(currently I only want an ISA or any other halal profitable account due to some circumstances)
I’m confused as I do understand risk involved with profits up n down but capital being effected is worysome,if things go wrong will I loose capital?
Or I should buy some gold stuff for them for this initial payment…
Kindly guide jazakallah (worried mum)