Is she staying in your room or a different room? If she's in the room with another CC member, they just should leave the number of lanyards for how many people are in the room.
If she goes with you to the DVC desk when you scan your KTTW they will likely just hand her a lanyard on the first day when they are giving out the lanyards. They used to leave them in the room, but we find they are only giving them at the desk our last few cruises. Last time they just asked me "how many?" and I said "3" since the rest of my family wasn't with me.
Is this your first cruise Silver? If not, you could take a lanyard you got from your last cruise along for her since you're going to get yet another one on this cruise.