If anything, Louise probably exhausted what magic power she brought with her from the other world, we were already clued in by their findings that the modern world is practically barren of magic power. She'll have to find another way to "recharge", I'd say. Not via the Fate method, I hope.
Anyway, this terrible arc really ruined my perception of both Kanji and Bartholomeus and tanked my enjoyment of this manga. I can only hope it gets better, but I don't know.
If it doesn't... well, maybe that
other newer farmer x female knight reverse isekai manga would do it. Some might call it a rip-off of this, but as Fate's Shirou Emiya puts it, "There is no rule that says an imitation cannot defeat the original."