as a female gamer who built her own PC (with lots of help from some people here ), i wanted to throw in my two cents.
if i am correct, she wants a nice rig to play swtor, and other games? The PC i built, i did for about half her budget. And i game a lot, and it runs all my games 'like buttah'. I'm not sure how she feels about it, but, my recommendation is to get a solid machine, which she can do for half that budget, and take the rest of her money and upgrade her keyboard, headset, mouse, get dual monitors (upgrade to some 120hz monitors and thats about 1k right there).
Honestly, unless she is a professional gamer and needs a $3500 machine, i think she is much better off upgrading her peripherals to make her overall gaming experience better, or saving that money.
i can't find the thread where i asked for some help building mine, but that was a while ago.