She was probably tasked with going through all the notes and prep materials, then writing a few things on a note card, so Joe could seem to understand anything that is going on.
If they had some aide write them, this is probably what would happen:
BIDEN: Oh, er...okay. (Irritated) What are these for?
AIDE: Oh, they are for the G7 meeting.
BIDEN: The what? What is the meeting about?
AIDE: Well, uh, it's...ahh...
BIDEN: (Irritated) Does, uh, does er...the woman...uh, wife know about this? What are these for?
AIDE: I'm sure she does.
BIDEN: (More irritated) Well, why are you bothering me with this for? What business is it of mine?
AIDE: The, uh...cards are for you, sir.
BIDEN: (Even more irritated, eyes squinting angrily) Why do I need them? Do I have to give them to someone?
AIDE: No Sir, they are just to, uh, help you when you talk to other world leaders, to keep things straight. I-
BIDEN: (Shouting) Someone set up a meeting and didn't even bother to tell me? Where's my, er, thing, the, uh...who is that, uh...
AIDE: The Chief of Staff?
BIDEN: (Shouting louder, his hands clenching and unclenching) No, you worthless jackass! The...the...
AIDE: Your secretary?
BIDEN: (Eyes bugging out angrily) NO! What is wrong with you? Why do they send people like you around? Don't you have anything better to do?
AIDE: Let me get your wife, sir. She she can help. (Turns around and runs out in a panic)
JILL BIDEN: (Soothingly) What's wrong, Honey?
BIDEN: (Eyes still bugging out, shouting) What is going on here? They set up meetings and don't tell me, and send morons around to give me cards I am supposed to sign and mail to someone, or what, I don't know, and-
JILL BIDEN: No, it's okay Joe. We just have some people who you are going to meet, and there are some things to help you on those cards.
BIDEN: (Calming down, holds up flash cards) These?
JILL BIDEN: Yes, Joe. Just put them in your pocket for later. You don't need to look at them now.
BIDEN: (Calmer) Oh. I can look at them now. That isn't a problem. Can you get me a pudding cup?
JILL BIDEN: Vanilla or chocolate?
BIDEN: (Eagerly) Can you get butterscotch?
JILL BIDEN: I'll see.
BIDEN: (Looking at cards, explodes in anger) What the hell is this gibberish? What am I supposed to do with these things? I can't even read them, they don't make any-
JILL BIDEN: (Takes cards and looks at them, shouts at aide) You stupid incompetent fool! You are supposed to give them to me so I can write them out for him! How long have you been doing this? Don't you know that my handwriting is all he can recognize? Anything else sets him off!
AIDE: (Stuttering) I, ah...er...uh...didn't, er, ahh...