I guess one question is does brake fluid dissolve in gasoline? I don’t know, I know it does in water. If it does NOT dissolve in gasoline, then you have a big problem. I’d go buy a bottle of whatever brake fluid she put in, get a glass, and mix a little of it with some gasoline. If they mix completely, then at least your engine won’t stall when a big slug of brake fluid makes it to the injectors…