Use bento box style plates and put the foods she will eat alongside new foods to try. Have a one bite rule - you can't say you don't like something until you've tried one bite.
Additionally, lean in to what she will eat and introduce variations of it - chickpea or lentil pasta and add the same sauce she likes to help disguise any change in taste.
Things that my picky eater will surprisingly eat - mini cucumbers (raw), Guacamole (mixed with Guacsalsa from TJs), Seaweed, sweet potato fries, and apples (sometimes with peanut butter).