To some degree, it's limited by what you ask for. Basic things - food and small tools and such - are relatively easy to obtain, and she has offered in the past to help find things if people have specific requests. But I don't have enough knowledge to be very elaborate and I have most of the things I need with me, in any case.

[Which leads to...]

It's. A little terrifying, how much power she seems to have. Besides being able to - it seems - travel between worlds and lift us out of them, she also has granted some kind of magic to everyone she brings here. Though, in some cases, that means any special abilities they may have been used to were taken away.