After dying, she is reborn as a pitiful girl in the 1970s, unloved by both her father and mother. With billions of supplies at her disposal, she decides that low-quality family affection is no match for the high-quality life of lying flat.
To live a peaceful life, she brings out her hoarded supplies and, with a grand sweep of her hand, becomes an anonymous hero.
Rice and vegetables are plentiful, with generous portions to keep everyone full.
There are all kinds of specialist books, and rummaging around in her space might even turn up some advanced equipment she “happened” to seize.
As for how to use it?
Specialist matters should be left to the specialists. She is merely a porter helping build a better home.