She didn’t let it slow her down exactly, but it was clear through the rest of the episode that she knew the worst case scenario behind her actions.
Upon dislodging her makeshift weapon from one walker’s skull – a really gross one that had one eyeball just dangling out of it like a lone grape on the vine – Alicia took a slo-mo face full of blood and soon discovered that she’d just put down one of the irradiated walkers.