How do you respond to her while she is eating or while you are offering food? Sometimes without realising you will be anxious at her lack of eating and she will pick up on that and become more panicky around meal times.
My ds was a terrible eater but not phobic of food, just very stubborn and determined he wanted things his way. The only thing that worked for us was just to remove all pressure and cojolling him into eating. Very hard to do when you are convinced they are starving themselves.
We don't discuss meal times or food around him really as he just immeditely starts saying 'I don't want dinner, I don't like potato' or whatever, sometimes just through habbit or sometimes just because he likes to disagree with everything .
I basically put a meal in front of him. I don't comment on whether he eats it or not. I don't want him to eat because I am forcing it or because I am praising him, it then becomes a power struggle as he knows I want him to eat it. All that works with him is him thinking I couldn't care less whether he eats it or not, that way if he's hungry, he WILL eat it. They are all different though but as soon as I stopped offering him things or asking him to try bits or even just touch food, he started eating much better. I just leave him to it.
Have you tried giving her her usual crumpets etc but just putting different toppings or serving it with something else? That way it's still familiar to her but it may take months before she decides she is ready to try the new food.
Way I see is, you can stop offering her the few things she will eat and basically starve her into submission, which is always risky and can become a battleground (what I tried with my ds and every meal time ended in a tantrum and me pleading with him to eat more). Or you can go with it, not force and wait for her to try more when she is ready. My ds is 2.6 now and although he still doesn't eat huge amounts he is not fussy at all. He will sit and eat cottage pie, cheese on toast, fish fingers, chicken breast, carrots and suede mashed together, chips, egg, cereal... things that justy a few months ago he would have never touched. Like your dd he was terrible to wean and just wanted milk. I am sure she will grow out of it but the less forcing and asking her to taste things the more control she has over her hunger and she will learn to eat more things in time. It's very painful though, have cried many times when putting my ds to bed after he's eaten less than a baby sparrow would!