Hey Shelly, I used to drink vodka pretty often for awhile there and I usually bought Ketel One, Chopin or some obscure potato vodka. Right now, I would either buy Chopin (potato) or get a Charbay flavored vodka like the Meyer lemon, pomegranate, red grapefruit or blood orange. They are flavored with real fruit, as they explain here: http://www.charbay.com/VODKAS.aspx
I actually think that she would love many of your gin cocktails and may even learn that she doesn't have to limit herself...just sayin'.
As for vodka cocktails, the vodka tonic is obvious, but tasty, but here are some real cocktails to consider:
Triomphe Cocktail
1 1/2 oz Vodka
3/4 oz Lemon Juice
1/2 oz Yellow Chartreuse
1/2 oz 1-1 Simple Syrup
Shake well with ice and strain into a cocktail glass. Garnish with lemon peel.
Yokohama Cocktail
1 Dash Absinthe
1/6 Grenadine
1/6 Vodka. (1/2 oz Awamori)
1/3 Orange Juice
1/3 Dry Gin
Shake well and strain into cocktail glass. [she'll never know she's drinking gin unless you tell her! You could also just double the vodka]
Madras Cocktail
1 1/2 oz vodka
3 oz cranberry juice
1 oz orange juice
1 lime wedge
Pour all ingredients (except lime wedge) into a highball glass over ice. Add the lime wedge and serve.
Cape Codder 2 ounces vodka 2 or 3 ounces cranberry juice cocktail 1/2 ounce lime juice club soda Glass Type: Collins glass Instructions
Pour vodka (or white rum) into a Collins glass, add cranberry juice cocktail, the juice of half a lime (some leave this out,) and a couple of ice cubes. Top off with club soda or seltzer (some leave this out, too, doubling the cranberry; we don't). Garnish, if you wish, with a slice of lime and/or a sprig of mint. Madras Cocktail
Mix 2 ounces vodka and 2 ounces OJ in a Collins glass, slip in a couple of ice cubes, and float 2 ounces of cranberry juice; serve with a stirrer and, if you wish, a wedge of lime (people like something to play with). Moscow Mule1/2 ounce lime juice 2 ounces vodka 4 to 6 ounces ginger beer
Mike Romanoff
[*]2 ounces vodka
[*]1 teaspoon Cointreau
[*]1 teaspoon apricot liqueur
[*]1 ounce lime juice
[*]2 dashes bitters