Considering the situation described above, the best advice to be given to Deidre is to establish a Sole Proprietorship.
As a Sole Proprietorship, she would be the alpha and omega of the business, thereby avoiding the interference of her aunt, Penelope.
Also, as a Sole Proprietor, should the business fail, she would be the only one responsible for the liability when the bill collectors come, thereby freeing her aunt from any indebtedness.
Again, given that Deidre is not worried about personal liability and Penelope wants her not to leave the company, Sole Proprietorship is the best deal for her.
Hence, in this case, it is concluded that the correct answer is "Sole Proprietorship."
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