Now that she knows, she feels relief more than anything. Naturally, she still worries: the consequences of her daughter's calling are too terrible for her not to, but mostly, she's relieved to know there's a reason for her child's failing grades and apparent waywardness. She may not like it, but at least she can understand it, and be as supportive as she can.
She puts the knife away, picks up the sandwiches she's made, and heads for the door. 'One girl in all the world' Buffy may be, but as far as her mother's concerned, she still needs looking after.
In other news: today's felicitations go to girlwithjournal, who hasn't updated in a while, but hopefully is still around in LJ-land somewhere.