3 year old refusing to eat anything

For like 2 and half days I noticed my daughter seeming more tired, at least to me I feel like, but she sleeps like 9 hours at night and doesn’t take naps during the day anymore, I don’t know if that means she should be sleeping more or not. She’s drinking liquids fine, but she just refuses to eat anything, she’s always been super picky as it is but not to the point where she eats nothing. She plays fine and everything, yesterday the first half of the day she ate pretty decent but then she took a nap and after didn’t want anything to eat, just wanted something to drink, she loved her juice last night. Today she woke and I gave her a pediasure for the lack of food she’s eating, she drank half of it, then drank some water but not a ton. Then she asked for apples, I got her some, she decided she didn’t want it after I prepared it for her. I tried oatmeal, yogurt she likes and eggs, she refused all of it, to be fair she doesn’t really like eggs and doesn’t care much for oatmeal but she usually loves her yogurt. But I had been trying to give her stuff with more vitamins. She was fine just a few days ago, eating and everything.

I’m gonna take her in for a walk In on Monday if she doesn’t start eating, any ideas? She doesn’t seem sick otherwise but I just don’t know what’s causing her to be like this. It’s just hard because my husband has been bedridden for 3 or 4 months now. I have also a 1 year old and I have no car and no help because my mother is recently sick with pneumonia. So this has me stressing so bad over, I ordered her some vitamins too for her age. She’s just acting like she has no appetite or something. Any advice would help?