When was the source that defines "Independent Woman" as “A woman who pays her own bills, buys her own things, and does not allow a man to affect her stability or self-confidence" founded?
Independent woman:  Similarly, the definition of an “Independent Woman” in the Urban Dictionary is “A woman who pays her own bills, buys her own things, and does not allow a man to affect her stability or self-confidence. Urban Dictionary: Urban Dictionary is a crowdsourced online dictionary of slang words and phrases that was founded in 1999 as a parody of Dictionary.com and Vocabulary.com by then-college freshman Aaron Peckham.
1999