A couple of things.
My DD hated the spoon so I just gave up. I gave her pieces of food that were easy for her to pick up and mash with her gums and let her get on with it. Letting babies feed themselves this way is no problem and many people think is preferable to spoons and purees. Research 'baby led weaning'.
Secondly, even taking this finger food approach that my DD preferred, it was still several long months before she was eating in any great quantity. I started her on food at 24 weeks and I would say she was 9 months before she started eating much - and some days it still isn't much. This is fine - there is a phrase, food is for fun before they're one. They are still getting their calories and nutrition from milk - whether breastmilk or formula, it is sufficient for their needs.
I am no health visitor or doctor but I didn't reduce my baby's milk until she seemed to be ready (wasn't finishing her bottles). She is 11 months old and still has three - four bottles a day, as well as her three meals and a snack. If she were hungry I would give her the milk that she wanted no question.
What I did do was start (once she had got the idea of food) to offer food before milk - at times when she was slightly hungry, but not desperately so. I found soft, nourishing foods she liked (avocado, banana) through trial and error and built up her appetite and understanding of food by giving her those familiar things when she was hungry. A mix of familiar favourites and new tastes every day has worked for us.
You sound stressed and upset and that's no wonder - I think the advice you have been given is upsetting you as much as your daughter's lack of interest in food. I would say relax, try to enjoy it, think of things that you think she might like, look at the weaning boards on here, and let her go at her own pace for the next few months. She will pick up on your stress otherwise, and that will be a much bigger problem in the long term.
Good luck.