If she has texture issues (sensory problems), that's one thing. If she's just obstinate, that's another.
How old is she?
I'm a big believer in 4 things:
1. good manners (if you don't like something, you don't get to say it's disgusting, or cry, or throw it)
2. Many foods are an acquired taste, so trying them over time or in a different form makes all the difference
3. Hide them in other foods - I became a master at this because I wanted meal times to be pleasant and harmonious. You'd be amazed at what you can sneak into a bean burrito, a pasta sauce, a pancake, a falafel made from a mix, a lasagna.
4. Let her see you having fun with things and enjoying them. If she's not hungry, the food gets put away. She will not starve. She won't. (Repeat that 3 times.) But you don't make a separate meal and kowtow to pickiness. You put a bit of an assortment on the table (within reason) and let her try.
You also vary the recipes for what she DOES eat - mashed sweet potatoes one night, sweet potato oven fries another night. Then you make sweet potato oven fries but add in slices carrots or butternut squash (similar in color). After 3 more successful nights of that, you add in broccoli or cauliflower florets. And so on. If you make mashed, you add in squash. You put a hummus dip with veggies, not just pita bread. You make it with tahini until she likes it, then you put a tahini dressing on salad. Turn the bean burritos into more veggie-filled items with 2 types of beans, then 3 - then add green peppers or frozen corn or peas, then top with some cheese and enchilada sauce. And so on. But take the fight out of it.