My DD is like your DD and is usually a great eater. When she is well I won't offer alternatives to the meal surmise been served (unless it's something new and she generally doesn't seem to like it - which is extremely rare) On the odd occasions she is unwell and not eating her fave foods I will sometimes see if she wants an alternative, kind of to test if she is really hungry or not. I will (usually) still offer a good choice. For example, if she's not eating her hot dinner I might see if she wants a piece of cheese. tBH, she usually doesn't want this either, but I feel better in myself. A week ago it got to tue extreme that she had literally not eaten or drunk anything all day so I offered ice cream for dinner..... She didn't even want much of that which just goes to show how sick she was!