The most popular cameras in the 70 for film was probably the following in order
Nikon F1
Argus C3
and Nikon AE1
I would NOT NOT be interested in going back to film.
Remember, the best tool of a GOOD photographer is a trash can.
If you shoot 100 photos, maybe 5-10 may be presentable. Trash the rest (or delete). Them maybe out of that 10 sometime ONE or TWO may be exceptional.
Also digital will permit her to shoot in raw format, permitting her to edit image AFTER the shot.
Use digital and get her a copy of Photoshop. Or a copy of Photoshop.
Cost of film + processing will become prohibitive. Even in the days of non-digital, the processing cost was a lot. That is why many of us had their own small darkroom. Supplies and kits to process 35mm color and prints were common for home color processing. BUT Digital eliminates most of that cost. Prints are only a file transfer away to 1 hour at Walgreens. ALSO, digital, for the most part, has a much improved resolution.
I would recommend a Nikon D3 body and a couple of lenses, USED maybe from Adorama. They have a good used department and precisely rate their condition and description.
Maybe more important - what type of photography is she interested in. Sports - then telephoto maybe 700mm- macro - macro lense - scenery - 50 mm or wide angle.
A lot to consider. Best wishes. and I would never claim to be an expert. Ha.
I am guessing you have already solved this issue. So in retrospect, how did you come out and what type did she get.