I went thru a complete eating strike from Feb - May with my 2yo. He would eat 1/2 a nectarine and nothing else but water for 4-5 days. He lost 5lbs in 2mos and went from being a bad sleeper to a non-sleeper.
What I learned from his therapists (he was a premie with health/developmental issues and is with the Alliance) and the GI specialist at CHP (not from the peed, who kept blowing me off): a typical toddler eating strike is when they stick to a few foods (mostly whites/carbs) for 2-3wks most, and weight loss is never an issue. Keep them hydrated and keep offering foods and including them in the prep (just like you're doing). Picture their meals on a weekly basis, not on an individual meal basis.
My son ended up having ulcers in his throat and stomach, making eating/digesting very painful - he got them from a cold that caused a ton of post nasal drip and vomiting. Once they were healed, he was good to go.
So, hopefully, there haven't been any health issues to trigger poor eating - but there's an example in case you do think of something.
Good luck!!!