Sounds like you already have an idea of what may be going on.
Follow your gut. If she is fainting, you need to get her to talk to someone and if she doesn't you may have to take action and do the talking for her. She may not be happy, but if she's telling you this stuff and you are seeing...
What brand of emergency survival kit do you think would be the best for a family of four? Do you have to store them in cool places to keep them from spoiling?