I would resist the urge to buy lots and lots of stuff - V mostly ignored all the toys until much older!
But some things that would serve you well in the months ahead are a set of stacking cups.. We also had a thing that you tie to the crib with different animals and a sort of rudimentary "puzzle" with attached pieces, that also rattled or squeaked..
Oh and we have a set of stuffed shapes with different sounds and textures:http://www.amazon.com/Manhattan-Toy-201 ... B0000A1Z2A
And a set of fake keys is great! There are electric ones that you press buttons and get noises and lights.. and V also has a set that came with this "purse":http://www.amazon.com/Melissa-Doug-Pret ... d_sim_t_29
She didn't get this until much older (~18 months), but I think it would be a great toy to grow with. I like to buy things they'll get use out of for a while down the line.
Oh, and a nice shape sorter might be something to keep an eye out for as well.
All this is stuff that she would use minimally now but might "grow into." If you want to keep it minimal I would just get her some toy keys and a few plastic cups from your kitchen and call it a day.