Continue to ignore the behavior if it is getting her attention it could be another reason to do it, so dont discuss it , as if you arent aware it is happening, and see what happens, she may find once it isnt imporatnt she stops it, so dont talk about it anymore, if she is till getting adequate nourishment how she eats isnt too big a problem.Does she do this at other peoples homes and school or is it just in her own home?