For my money (not necessarily in order of preference):

(1) One of the 35mm Voightlander rangefinders like Colman sports.  Not exactly cheap, but the interchangeable lens options are top notch and there are several varieties of the camera with different mounts.  Cons: a bit slow when compared to modern styled cameras with manual everything - but highly flexible for creativity.  Some of the best remembered street photographers used this type of camera/lenses (Leicas).

(2) A good, used modern 35mm SLR like a Nikon F100 or F90. (a used F100  goes for about $329 at B&H).  Others like the F70/80 can be found for much less. A brand new F75 goes for under $170 w/o lens. (Maybe she could borrow dad's lenses!)

(3) A manual 35mm SLR like the Nikon FM10.  ($249 new at B&H with a 35-70mm AIS lens). Advantage is that it is all manual and there are lots of used lens options for manual focus Nikons. This camera also has multiple exposure, mirror lockup and depth of field preview. Many higher end cameras don't have this anymore.

(4) If you want better B&W images, also think about medium format.  Used SLR kits are even more competitively priced now than 35mms.  I saw a used Mamiya 645 Pro on e-Bay the other day that went for about $600 and included a metered prism viewer, 80mm lens, case and film back. This was Mamiya's top of the line manual focus 645 format camera for years and the same kit purchased new was about $3K. Today, the manual focus lenses for this camera are widely available for good prices. I believe the new AF versions (camera body) can also use digital backs (not inexpensive) and can be found used.

Hope this helps.
 

I can swear there ain't no heaven but I pray there ain't no hell. _ Blood Sweat & Tears