Any help on my daughters eating? 😩

Hi, I’d really appreciate any help I’m at my wits end 😩. I have a 9 year old daughter who has always eaten fine. Recently she’s been at home a lot more due to Covid and I honestly believe that all this is just her bored wanting a reaction. She recently “doesn’t like” anything I make like the home cooked meals and just constantly argues back about eating them. So I asked her what she would like to eat and she told me, “pepperoni pizza” which we have once a week as a treat. Surely I can’t give her that every night! She literally takes one bite of food and says I’m full of that. So I ask her to leave the table if she’s done because she then starts arguing wanting chocolate and pudding when she hasn’t touched her dinner which then results in an argument upsetting her younger siblings. If I send her to bed “hungry” which is because she’s refused tea, I then get “I’ll tell everyone your a bad mum and starve me” I’m at my wits end with this and her attitude, any help will be appreciated😩 I do try not to give her a reaction because I believe this is what she wants, but it’s annoying when she demands chocolate (which she doesn’t get) but refuses food and she doesn’t get why that’s not ok, but she’s ever been able to eat chocolate without tea! I’m baffled 🤯