Ah mum, this is very common lah when they start growing and getting more independent! My girl also went through the same phase, suddenly reject rice, want to feed herself, play more than eat, the whole drama. I think at this age they're just exploring and asserting themselves, plus maybe junk food is more exciting to them than plain rice, so don't worry too much yet. But since you're concerned about her weight and intake, best to bring her to the doc for a check-up and weighing, they can tell you if she's actually losing or just being a picky toddler. In the meantime, a few of us mums tried mixing rice with things she enjoys (like mixing with the junk food she loves, or making it more interesting with sauce/veggies), and also just letting them self-feed even if messy because at least they eating, sometimes forcing feed actually backfire. How old is she now?