There's no real problem with corn and peas, but they are two of the sweetest vegies, so perhaps she's sticking to them for that reason.
If you are trying to expand her range, offer other vegies at the same time as her favourites. No pressure, it can take up to 20 introductions of a food before a toddler will try it. Don't give up, toddlers haven't fully developed their taste buds yet, so there's not really 'like' and 'dislike' just 'familiar' and 'unfamiliar' tastes.
I would offer less cows milk. Filling up on milk will inhibit her appetite for other foods. She only needs a small cup of milk, a small piece of cheese and a small tub of yoghurt to more than meet her daily calcium requirements, and that's not taking into account what she'd get from other sources, such as green, leafy vegies, fish, etc (which are better sources of calcium anyway).
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