Kids and food, it can be the bane of your life can't it. Big sympathies hon' but yes, to be honest it is your responsiblity to "make she she eats properly", seeing as how you asked, no offence or anything meant, but who else is going to do it if you don't???? I do know how hard it is and I'm not being rude or horrid or anything.
My little girl started off eating liver, greens, lentils, ec etc, now she's a lot more picky.
If I let her she would eat dry bread for every meal!
How about letting her have sausages but always offering an alternative as well and putting veggies on her plate. Sometime she won't eat them but now and then she might. Bit by bit reduce the number of sausages.
How about making a sausage casserole and also just putting one chopped up sausage round the outside?
This is what I do;
I count out 5 peas in a line on the table and say 'riht, there's 5 peas there, now don't eat that pea, right' and she promptly pops it in her mouth in fits of giggles and I pretend to be all upset, and say 'ohh no, I can't believe you eat that pea, you little monkey, right, well don't eat this pea will you', and we continue this counting/eating game until most of the broccoli, carrots, and of course the peas have gone.