The iCloud Data Recovery Service gives you access to data including photos, videos, notes, reminders, and device backups through the iCloud web portal, even if you’re locked out of specific Apple devices.
I should’ve elaborated a bit. My concerns are a) that it’s a fake iCloud Data Recovery Service contact so she won’t delete it, b) someone’s accessing her iCloud account via Safari.
I’d remove it, log out all browsers from icloud.com and change the iCloud password. Everything could be fine, but those are cheap actions to take when there’s any worry.