Have you ever read the book "the latchkey dog"? Your situation made me think of that book right away, as half of the scenerios depicted in the book were pretty much the same as yours.
As you're fussing about her food, she's realizing she's got some control there. She's calling the shots. The more you try to entice her, the harder she will be to please. Assuming she's healthy that is.
I would right away start getting her to do some "work" for all things, but especially for her food. Dogs like to work, it makes them feel safe and secure and taken care of. First off, stop adding anything to her food that you don't plan on adding regularly. Second, set a feeding time for her and stick to it. When it's her feeding time, get her to "sit" and "wait" a distance (say 10ft, 5ft, whatever) from where her dish goes. Put down her dish, count to ten, then tell her "okay" (I'm assuming your dog knows these commands or something similar). Then ignore her completely. No praise for eating, no coercing, nothing. It would help if you ate your own food at this time, as dogs are social animals and like to eat together. After 15-20 minutes, pick up her dish and put it out of reach. She WILL NOT starve to death. Within 3 days, she will catch on, guaranteed!
Also, if she's home alone during the day, give her a "job" to do. Provide her with a lovely chewing treat (like a frozen stuffed kong) that she gets only when you go to work. Have her "sit" or "down" and "stay" in the place she usually likes to relax while you're gone. Put her in that position/spot with the command up to 15 minutes before you leave (depending on how comfortable she is with "staying" - my dogs would only last maybe 5 minutes), and as you go out the door give her her chewy item and remind her to "stay" - no prolonged goodbyes. Now she has a job to do!!! She needs to "stay". Any dog would work up an appetite after such a hard day of work!
Also, do obedience drills off and on when you are home - commercial breaks are a great time for that. If you let your dog on the furniture, get her to do something for you first, s/a "sit - down - stay - come".
I know it sounds weird, but if you practice "nothing in life is free", and remind your dog that you're in charge, and you take all the fuss (and options) away from eating, she will start to eat better and be a happier girl over all.
You can make yourself crazy trying different foods and adding different things, and eventually your little pupper will have you down on all fours sampling her liver pate to show her how tasty it is and won't she please just eat it?
Or, you can remind her that you're alpha, you "hunted" up the meal, and she can eat what you provide when you provide it or go without. I assure you, she will eat and be glad that she no longer has all the worries that come with "being in charge" - they're back with you, where they belong