Recovering "unsaved" (error message) data

URL of experiment: https://run.pavlovia.org/ctaher/atonalmusictimeexp/html

Description of the problem: One participant told me that she got an “error saving data” message at the end of my experiment (she completed the experiment twice and got the same error both times). She used the same computer and browser as someone who had successfully completed the experiment earlier the same day (yesterday/very early today). Is there any way to recover her data?
THANK YOU VERY MUCH!