What is the woman planning to do this evening?

W: Bob? It’s me, Barbara. Am I ringing at a bad time?
M: No, no. That’s all right. Is it something important?
M: No, not really. Some American friends are here for a few days and they want to go for a meal this evening. I think maybe you’d like to come.
M: I’m afraid I can’t. I’ve got a bad headache.
W: Oh, have you? I’m sorry. Why don’t you take a couple of aspirins and lie down for a bit? You’ll be all right in half an hour.
M: Yes. I know, it’s not just the headache. I’m afraid I really ought to do my washing this evening and I’ve got to write home to my parents, too.
W: All right. Some other time then. Well, have a nice evening, Bob.
M: Wait a minute, Barbara. I’ll ring you early tomorrow morning.
W: It’s OK. See you then.