M.T.
I can't comment on the vitamins or the lead because we didn't encounter either after my son's 1 year check up 2 weeks ago.
But as far as transitioning to sippy and solids, I'm with you, give or take a few weeks. I started my son on a sippy around 10 months, although we gave it to him to hold and try out as early as 7 months. I second trying the Nuby soft nipple sippy cups as they allow the milk to come out easier and are not such hard spouts. Are you sure it's the sippy and not the whole milk she doesn't like? My son didn't want the whole milk at first, partially because it was so much colder than the formula. It does take awhile to get used to a sippy, though, and my son still has a bottle in the morning and a night. Just keep offering it to her, but don't force her to take it and she'll get the hang of it.
Gerber does have some good starter foods for solids. If she likes bread, try some toasted and cut into little pieces with a banana or other fruit spread. Pasta is great in almost any shape. My son loves peas, carrots, and corn cooked until it's very soft. Bananas are a great starter as well. It's really safe to offer her anything you eat (assuming no allergies) so long as it is in very small pieces and she's being supervised.
Good luck!