Minor Spoiler: what was she eating?

During the scene where she's waiting for the phone call she goes into the kitchen or pantry or workroom and gets a tin out and starts eating stuff from it.

She then also starts kicking on the wall.

Was she eating shoe polish??? Or was it just chocolates or cookies???

I saw this at my grandmothers and her TV is from like <1985 so the picture really wasn't that great.