Please note I'm not a horticulturist! That plant (at least the one in good condition) looks like an Impatiens to me. According to https://www.thespruce.com/shade-tolerant-impatiens-flowers-2132141 you need partial/full shade. That wilt does look like sun damage to me, so that's my guess. It also needs well-drained soil, so maybe also check how it's been watered recently.
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Thank you! That makes total sense. I'll let them know. On a different note, reddit is(was?) my go to spot for stuff like this where I need advice on something I don't know much about. I made this post here instead of reddit, and wanted to see if the fediverse is truly a reddit replacement. I'm glad to see that it already is.
Does it get any sun at all?
It used to get a lot more sunlight on the other side of the door, but I don't know if it gets much direct sunlight now, because it sits behind the one with the flag. Does it need direct sunlight?
Yes, nearly all plants need at least a little. Flowers definitely do.