Soup5 well considering Silver's background she isn't the type to take bad stuff said about her or the rest of the other humans from her homeland so yeah he may be a child but Silver could kill him if she wanted to but she will probably give him a serious warning not to mess around with her since she and her hunting partners have faced and defeated a few creatures from her homeland that are called Elder Dragons which are a class of monsters introduced in the first generation. Unlike other monster types, which classify monsters by shared traits, Elder Dragons are creatures that defy typical classification and reside outside of the standard ecosystem, regardless of their resemblance to a dragon. These monsters are rare creatures with immense power that have lived since ancient times.
Also I'm guessing that Girgas would be alot weaker then and Elder Dragon from Silver's homeland since the quote below gives a bit more insight about Elder Dragons.
"We've taken to using the term Elder Dragon for any creature that defies ordinary classification, but I suppose you could call them a type of phenomenon: disasters, cataclysms, living, breathing forces of nature."
- Chief Ecologist, Monster Hunter:World
P.s if you want more information about Elder Dragons then check out this link that is down below.
https://monsterhunter.fandom.com/wiki/Elder_Dragon