Gosh I’m sure you should be able to go away without worry by November 2027. She’ll be 20 by then right? I hope things have changed a lot for the better by then.
Someone of your daughter’s age would have to be profoundly cognitively impaired not to be able to make some simple food for herself without reminders. This is incompatible with her being able to make a cake, babysit, go to meals and on public transport etc. QED She is choosing not to do these things because she doesn’t have to and you have always done it. She really doesn’t need you to tell her when to eat. If she ever asks that again just say ‘it’s up to you. When you feel hungry’
My 19 year old I expect to sort herself out entirely if we are not here. Plan and cook a meal, wash up etc etc. My 14 year old I would leave something to heat up and remind him it’s there. He can do easy pasta, pizza, beans or cheese on toast stuff for himself. He might choose not to bother but that’s up to him he won’t starve. I don’t check up on him.
I don’t do breakfast or lunch for either of them. I leave them to get what they want when they want for those. I enjoy cooking and I do like to feed my kids so I make family evening meals for all who want them and I try to get DS to join in so I can teach him stuff. They are both expected to help set and clear the table and do the dishes.
If you want to progress to more independence just leave the food and not the detailed instructions. Let her get her own breakfast and lunch routinely (surely she does when you are at work?) If she misses a few meals it’s not the end of the world and you can still care for her by making family evening meals.
I think ‘can’t’ must mean ‘can’t make a decision’ or ‘feel anxious about’ rather than physically or cognitively having no ability to carry out the task. The checking in and you reassuring her are definitely reinforcing her worry and dependence as it gives a message to her that indeed she ‘can’t’ and needs you to help. If you step back and let her figure stuff out she will get more confidence to do this stuff herself. Try not answering all the reassurance seeking questions or turning it back ‘what do you think DD?’
It seems like this is a very pervasive pattern that you are not aware of how odd it seems to others. Honestly most people are not in such constant contact with teen DC or micromanaging them so much. My DD is on her phone a lot messaging people but never me!