You can do AD on Linux as well and have the account on her laptop be in active directory and passed along at login. I guess this can be done with other tech as well but I haven't explored that.
You could also move to a password less approach, say only authenticator on the phone via push notification or if there's some way to have the hardware ID be used as authentication in a password less scheme.
Edit:
A yubikey might do the trick? Then as long as that is in the laptop she won't need to supply a password.