Internet Recovery Boot Loop

A “friend” left her MacBook Air at my place a very long time ago. Since that time we have had a falling out. (Story for another time) I have reached out to her and she explicitly told me “she doesn’t care what I do with it”, “she doesn’t want it back”, etc, etc. I’ve always been a Windows or Linux guy, but definitely would like to reset the device to factory settings, and have a Mac I could use. I am booted in recovery mode. 1. I select a network. 2. Wait the 30 mins for Internet Recovery to boot. 3. Then I am prompted for her Apple credentials. I only see one relevant option to ‘Erase Mac’ and that option just reboots the device to which I start from 1. all over again. I have seen people get to bash, unmount some file systems, and reinstall this way. -but command + s does not get me there. Any recommendations to try to restore this PC? Thank you.