Hi K.,
Of course all she wants is yogurt and juice...it's full of sugar!! The key will be to cut down on the amount you give her while continuing to offer other types of food. Pretty soon her hunger will win out when she has no choice but to eat formula, veggies, etc.
Re: veggies, many times the reason that kids don't like veggies is because WE (parents) give in too quickly with thoughts like "oh, she doesn't like [this or that] veggie". I can't remember if the number was 15 or 20, but I remember reading some research that a child should be offered a particular vegetable 15 - 20 times before it can be determined that he or she doesn't like it. Most of us give up waaay before that number, so we're really hurting our kids and their future eating habits. So, keep offering veggies to her, while cutting down on the juice and other sweets that appear to be filling her up.
Here's something that was just sent to me from WebMD this weekend: http://www.webmd.com/diet/slideshow-juice-wars?ecd=wnl_pr...
They compare a glass of PURE apple juice (no extra sweeteners) to a candy bar!!
The slide you should especially pay attention to is on slide 13 of 16 of the slideshow: the American Academy of Pediatrics has set clear guidelines on how much is too much [juice]. For kids younger than 6, the AAP recommends no more than 4 to 6 ounces of pure fruit juice per day. For ages 7 to 18, the suggested amount is 8 to 12 ounces.
I hope this helps!! Send me a note if you want to know the different veggie tricks we've tried with our son...with much success! Also, the few times we offered juice to our baby, it was diluted by 50%, per our pediatrician...