If you have her e-mail address, you can go to your Moms tab and click invite friends. If not, then you'll have to send her CM's URL and then give her your screen name so she can find you and become friends with you on here, too.
You can click "invite friends" on top of page. If you know her email then you can send invite.
Or just go to her FB page, send her a message with your cafemom URL or give her your CM screenname and she can go to CM and put your screenname in the "search cafemom" box and you will pop up. If you don't have your profile blocked she can view it.
Hope that helps!