There are fewer foods with MSG than there used to be, but you're right, a lot of packaged foods have it. I avoid packaged foods almost completely. I got out of the habit of using them when my allergy first developed, so it isn't a problem now.
I just sometimes get surprised when a home cook uses it. The veg. soup was a surprise, as was a wonderful cucumber salad that I ate a ton of before I got the hint that it had MSG. :-(
Maybe she put a vegetable stock cube in it sometimes they have MSG in them.