My girl was looking for a dress for Halloween. Yesterday she found one on Amazon for € 35 and put it in the cart, but did not buy it. Today she looked it up again and it was € 50 so she asked me to look it up with my phone with my Amazon account - it turned out to be € 23 for me, less than half of what it’s for her!
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.
Use Firefox and max out all of its security settings. When you do this, the fingerprint protection is so good that not even Google can ID my PC anymore. I have to pull out my phone and confirm it’s me every time I log in.