The ideal solution is to confine her to a small space inside, too small for her to go potty, and have a dogdoor into a fenced yard. The yard can be very small, as long as it is big enough for her to do her business. Place her food and water inside and I bet she'll get it correct right away. Gradually enlarge the area inside you trust her in and pretty soon you'll have a completely housebroken dog.
You can have her with you when you are home as long as you watch her closely to make sure she goes outside. With my 4 Akitas I have had (2 at a time), it has taken me 2 days each to housetrain with a sum total of maybe 6 accidents after the first week between the 4 of them. (The girls got it first).