keypad usage when entering door with home mode on

I will likely have the system in home mode when the mrs and I go to sleep but the daughter is still out. When she comes in will she need to (a) disarm and then arm the alarm with the keypad at the front door, or (b) is there a way to enter you code on the keypad that will put the system at ease / won't trigger the alarm? I don't want to have to do a. Would like to just enter code in this case and have the sytem stay in home mode.