Username or EmailPassword
That might have been her next step if we hadn't found it (buried in a folder labeled "Useless Stuff", by the way!), but I have never had more than a handful of apps on an iDevice so it never even occurred to me.
I use it more on my iPad, as that has 64GB of storage, and it's much easier to install an app and misplace it. On my Phone, I tend to delete stuff I don't use and only reinstall when needed. I also don't put settings in a folder marked "useless stuff".. ;-)