Everyone around her was surprised, especially Austin who was standing directly next to Florence. Florence herself just shook it off, and even still reached down to grab what is assumed to be a gift from a fan. Zendaya also went up to Florence to check and make sure she was okay afterwards, too.
Source: https://www.buzzfeed.com/noradominick/florence-pugh-hit-with-object-on-stage-dune-event