I'm trying to figure out the best way to answer the question. I hope it makes sense.
When you purchase content you also download a license that is tied to the gamertag that purchased the content as well as the console that purchased the content. So it's not possible to download a game under your account and then install it to her Xbox and
have it work. You would have to download it through her account.
However, if you were to download them through her account on your Xbox and then install the games on her Xbox, her account would have to be connected to Live in order to be able play them (it doesn't have to be a Gold account, just connected).
In order to download them and have all the licenses connected properly, you'd have to connect her xbox to the internet and download them through her account.
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