Hi
There have been some great comments on this.
You've not mentioned what her breakfast, recess and lunch eating habits are like?
If these are good, perhaps there is not so much cause for concern?
My 9yo and I have an understanding. These meals especially breakfast, are non negotiable and must be healthy - although a bag of chips or a processed treat of some description are allowed each day at school.
Typically fruit and raw vegies are sent to school with homus dip or similar with rice/corn cakes, or even cold steamed basmati rice left over from the night before (she loves this but it must be kept very cold!). Different vegies every day, because kids get bored with same old same old.
If she complies with this healthy eating plan, then I don't fuss too much about dinner.
Not only is it common that kids prefer raw veg, it is also much better for them. (and us)
My sister was like this growing up, as were myself and my older daughter, who at almost 15, has now developed a healthy appetite for most things healthy, (although she is happiest only eating quality cuts of meat a couple of times a week.)
I don't ever harp on about all the under privileged kids wishing they could have what my kids refuse to eat, they're smart enough to know their scraps can't exactly be packaged up and sent off for consumption by others. It amazes me how many parents still do this.
I reason with them as best I can in a relaxed setting that garbage in = garbage out.
I also make it clear that if they wish to be invited to meals at their friend's houses, then they'd be wise to make an attempt to be agreeable, at least having the good manners to taste what has been set before them.
I am often pleased to hear other families reports, regarding my children's good table manners. It seems that as guests of others, they eat the majority of what they're given, even if portions are large, without complaint. Yes, even cooked vegies!
I believe this tactic has had the greatest result. The girls are highly social creatures and the thought of not being welcome at their friends houses because of antisocial eating behaviour, really seems to get through to them.
Hope your little problem is short lived!