If you make yourself too available in the virtual world, the other person might lose an interest in meeting you in real life. Use the research you've done before the conversation to suggest an activity you might enjoy doing together. She does not need a pen pal.
Accept this without becoming insistent or expecting them to say "no" loud and clear. Give them time to respond. As you add them to your contact list, they'll probably understand what your intentions are, so make sure you're okay with it. If the conversation ends up being about something bleak, like the tons of washing you have to do, cheer it up with some humor and jokes.