how do you reverse this kind of dog behavior?

My dog used to eat at our backyard for all her life but recently ​I switched to a different kibble brand which has made her so picky, she wont eat it outside but when I put the food inside and start spoonfeeding her, she will gladly eat it. I know that she's capable of eating, it's just frustrating for me because ever since that happened, I frequently made her eat inside again nd again without ever noticing it. The​ only time I can bathe her is when she goes outside (I don't bathe her everytime she steps outside tho). Now, she won't eat outside and would only accept food when its inside the house. I think I also made a mistake where I would pull her plate towards our backyard while shes eating so I can somehow get her to our backyard again. What can I do to make her eat outside our backyard normally again? ​​she always just used to run outside whenever food came but now she even waits for me to just put the food back inside. I can't always spoonfeed her inside, I just want her old behavior back.​