Right now, she had to make arrangements for the present matters.
The interspace was with her, and her trip would probably be a few years long. She had to leave behind sufficient food at home, otherwise all her family and the grandpas and grandmas at the cowshed would suffer.
Although food could not be stored for several years and would not taste good if stored for too long, there was still no issue with storing for two to three years.
Old rations might not taste as nice as fresh ones, but it was still better than having nothing!
If she left more food behind, at least she could ensure that the family would not have any food shortage in the coming three years. With these foods as a complement, they could scrimp on other foods, and her father can even use these foods to barter for other foods in the black market.