How to get your kid to eat...

Michelle • Baby 💗 born 6/11/17 & 💗 born 8/27/19

My toddler will be 3 in June. She has always been thin. She is only 25lbs and has not been gaining much weight in a year. The doctor didn’t seemed concerned. She will not eat much at all. My guess is she consuming about 500 calories a day! I’ve tried almost everything to get her to eat more and I just can’t keep fighting with her during meals. Any suggestions??