3 year old barely eats

So my 3.5 year old has pretty much stopped eating. Unless its a bagel, eggo, or just plain ole bread. Every night I make her something that I know she at least doesn’t hate. It takes forever to get her to have a bite and almost an hour of her sitting at the table until some (barely any) is eaten. After dinner she doesn’t get any snacks, only milk if she has eaten the amount of bites I told her to. It’s exhausting and a fight every bloody night. Took me an hour tonight to have her finish her dinner and only because I told her no Halloween Candy did she even finish.