Realistically, one person can only do so much. Protecting yourself is already an insurmountable task, protecting others is even harder.
How can she save them when she didn't even mention the apocalypse and they were already treating her like a madwoman? She almost failed to ask her brother and maid to come with her too, let alone all of the servants in her household.
And I'm sure she could've shouted for survivors to follow her to her happy house but that would be risky as someone who had been bit could follow her inside. Imagine fighting an infected whilst carrying/protecting an unconscious grown man
And in the novel, she had 20 days to prepare. That's barely 3 weeks to procure information, shelter, food, necessities- and the attack happened way earlier than she expected.
I'm sure she could've saved more lives if she was given enough time though.. it's a shame cause I really liked the villagers too
Honestly she could have at least tried to save more people :/
Even in her own household she only tried to save one maid, not mentioning the village, she really gave up before trying, it feels rather evil :/