Urianger
I do not believe Hylia is lacking in any strength, for my own part. She seems, from everything I gathered, much more content to sit in the shadows whilst her mortal chess pieces move about. And while I am not happy about being a piece, given Her opposite is, again based on assumptions, bound by mortal form it is only logical She does so. The fight we play out, time and again, is a mortal one.
I am sorry to say I have yet to see any indication Hylia is any way active in these parts. I believe whatever force keeps us here, also keeps other interferences out. Including, at least, the machinations of Divinities.