The landlord told her she would put a fan in the basement to dry up the carpet and if she needs to replace the carpet for mold she would have to raise the rent.  

It is carried by a lot of different flooring stores (like Mohawk carpet etc) but the prices may vary of course.

It will also need some minor sheet rock repairs and some carpet throughout the house, as well as a new stove and kitchen sink. 

Getting X bids for the same job spread over time will vary greatly.If the SFRs are spread about town or more broadly, you may need multiple vendors to support you (handyman, yard service, carpets, lino, painter, plumber) whereas the MFU gives repeat business and better customer/vendor relations (and maybe prices).

is it 30k under ARV needing carpet, paint, etc? 

Based on the houses I have in Parma, I bet you will get between 975-1000 if you didn't have those nasty carpet stains.  

It was most likely paint and carpets, which last 1-5 years tops in rentals. 10% in this scenario is only $76 a month.

About the only way I have been able to completely remove those odors are to:Remove old carpet and padding, remove existing window shades/curtains/blinds, paint walls, Change air filters and possibly have air ducts cleaned, pretty much anything porous enough to absorb odors will have to be removed for odors to be completely gone.  

By  "no major issues" do you mean it would only require a light rehab (paint, carpet, etc.), or are you moreso referring to no major issues related to areas like plumbing, mechanical, electrical, etc.?  

Tile, hardwood, laminate, and carpet flooring throughout home.