Clear her browsing data and try again, this happens with flights too.
This is why fingerprinting is an issue.
Sidenote. I went to by a boxset of books for my partner and it was ~50 for the set, I got back to pay the next day and it is 100. On ye third day it is ~70 with a note that it is down from 110. Scumbaggery.
Add that to the list