I am sorry I have realised how long this is as I went to post it!!
My DD didn’t like to eat as a toddler as she didn’t want to try anything new. XH would distract her with a milk carton - he’d draw attention to the cow (as we had dairy cows outside) - and then shovel it in until she said she was full!
It got her fed but she is still a very fussy eater at almost 12.
But she was our easy child - DS was the obstinate toddler and we ended up seeing a child psych for help as EVERYTHING became a battle - getting dressed, cleaning teeth, eating, nappy changes, putting shoes on to play outside. If you wanted him to do it he made it a fight. It was such a contrast from his mostly compliant older sister that we were at a loss.
After 30 minutes of watching us together she called me his comfort toy - he touched or cuddled me in some way for the entire session and really he is the same to this day. He didn’t care if it was good attention he just needed my attention - hard when there is an older sibling! His dad and sister were/are a far second place. He also had a lot of energy that needed burning off and the two combined meant explosions came easily - he is still quick to anger but he is learning to manage it without taking it out on others.
Anyway we ended up making games of everything. Need to clean his teeth, well we’d make it a wheelbarrow race to the bathroom - he and I against his dad and sister, crab walk races and I can’t remember what else. It used up a bit of his energy so he was calmer when we got there and easier to reason with. I don’t know about you but when my parents wanted us to do something and we didn’t want they would say “I’ll time you, see how fast you can go” - that worked on DS too!
He is still obstinate though and many nights become “get in the shower now or there will be no book when you get in to bed as you will have wasted all that reading time”, or on weekends “no movie after the shower”. Other times if he isn’t muddy and hasn’t been running around outside I just forgo that battle and we don’t shower.
I also do a lot of pre-warning still at nearly 10. So as we are pulling into our street I remind them (him) - we will take our lunch boxes out of our bags and put the bag in the cupboard, we will empty our lunch box into the dishwasher. If this does not happen then Y won’t happen.
Currently he wants a dog when the new house is built so when he grumbles about going out to feed his bunny I remind him if he can’t look after the bunny then he can’t have a dog. I’ll stick to it which will be a bummer as I want t dog!
On your specific dinner battle I wouldn’t have let her have the chips either but I probably would have let her eat something healthy like a piece of fruit and, like you, I probably would have let her eat on the floor if she would eat.
I probably wouldn’t have moved the chips till after she went to bed though - it was still a flash point when she saw they were gone so she went off again. If you move them after she’s asleep then the next time she looks for them it’s not such a flash point.
We never used to have the TV on at all when eating - changed in lockdown 2 with home schooling as we all just needed a break from each other so at the dinner table but watching TV was part of that. I do have the TV off if you are not eating rule but mine are a lot older (and it pisses DD off immensely when the TV goes off because DS has zoned out and is fixated on the TV instead of eating). I wonder if she is too young to really understand that so it just becomes a battle when you turn it off so then she is primed to refuse anything else you want her to do?
I’d work on not having the TV on at all for dinner time for the next while so that’s not creating another flash point. We used to all just talk about our day before I allowed TV. I have a friend who has everyone share their best and worst thing for the day - she’s young but if she is talking you could do something like that.
I also agree with the PP who said if she is getting a good healthy meal at daycare I wouldn’t be too fussed on dinner.
And finally you are on your own so be kind to yourself. A lot of my parenting changed when I separated from XH and I don’t even have 100% care - it is 50/50 so I get time to myself. That hard daily grind when they are here meant I let a lot of stuff go that I wouldn’t have when I had their dad in the same house to take over.