have you tried giving her a spoon, and you having a spoon too?
lewis went through a phase of going absolutely mental when it came to food time, he'd scream for an hour solid, if i managed to get it in he'd scream
now he has a spoon and 'plays'(he tries to feed it to himself) but happily allows me to feed him inbetween his own spoon going in...he's too busy 'playing' to be bothered with me feeding him.
i hate the kids not eating and they have a yogurt most days after dinner so like lisa, if i offer a yogurt to 'top' them up, they don't see it as getting their own way, just moving on to the usual yogurt