If she has a wireless mouse then she probably has an accompanying
wireless keyboard. With anything wireless, you have both a sender [mouse,
keyboard, etc.] and a receiver which is plugged into the computer
somewhere
[the signal is a radio frequency]. Sometimes that signal process gets
fouled
up so a Reset Button is provided [or was when I used a wireless
keyboard/mouse combination] usually on the keyboard somewhere. On mine,
it
was on the right edge of the keyboard [where the keyboard top descends
toward the bottom]. If her house is fairly close, drive over and look for
it. When you find it, press it to see if the functionality is restored.
