It doesn't have to be fed every 2-3 days to keep it from dying out...especially now that cooler weather is here and the fermentation slows down a good bit. Bubbling is a sign of the start of a good ferment but mine doesn't bubble constantly, though it is deeply fermented. My water stays cloudy and that's about it...certain feeds and temps will make it produce gas bubbles again, but that doesn't happen all the time and much less when I'm using whole grains...I think the spaces provided by the whole grains allows the gas formation to escape better than the finer ground grains, thus not many bubbles.
Tell her not to worry..it's still fermented. Not much can kill a good ferment and one would have to not feed it for a good long time before it would run out of available sugars in the grains on which to feed. The dried fermented feed is likely some dried brewers grains, which would only add to her fermentation. Just let that feed sit and the fermentation will grow, so no worries. If I can't kill a fermentation in two years, no one can....
There are times when I don't add fresh feed for almost two weeks and it is still fermenting along...who knows how long it would take for it to finally consume all the starches?
No, don't add more each time you feed....just wait until your bucket gets down low and then replenish. The longer it sits the deeper the ferment. In cooler temps, it may have to sit longer to give time for the slower metabolism of the LABs to inoculate all the grains. If you replenish too often, you'll just have a light fermentation going in the feed at all times...some people like it like that because it doesn't smell as strong, but the more fermentation you have going on, the more completely and more quickly it converts the grains.
