You’re not allowed to eat without saying a brachah. If you don’t know the correct brachah, find out, otherwise eat something else or don’t eat.
LB was referring to a brachah acharonah, after she had already eaten, so not eating wasn’t an option. However, she should have called a rav, or at least some type of Bais Horaah (or perhaps look it up on a reliable website). I don’t know if any if those options were available to her, though.