How are you when trying to feed her? Do you think you might be creating a stressful situation to eat in?
I don't mean that critically, but I know from my own experiences when my DS has been stubborn for several days in a row with food, that I start to get anxious, and irritable, and short..... and then erratic with how I deal with mealtimes... and then don't bother with cooking, cos I just think 'well, what's the point'.... but I soon catch myself, and problem goes away again eventually... (but then I am now firmly from the 'old school' approach of - you don't eat that, you don't get anything.... maybe 1yr old is a bit young for that though!)
I've found the best thing is to walk away, leave a few bits out, like a bowl with apple puree in it, a bowl with yoghurt, maybe a rice cake on the table, a stick of carrot, a mini quiche (eg), and something else, all looking colourful... and then perhaps a toy or two. Seem entirely uninterested or bothered, and let her play with it all and work it out, start to become interested, and also not feel that it is a battle of wills with her mum that she has to win at all costs.
But, that's just my first thoughts, and I am no psychologist, or doctor, and I am sure someone will come along in a minute with some far better ideas....