True, she has been a lasting influence including on Crosby, Stills and Nash who were friends and lovers.
Nash said he and Joni had to hire a new housekeeper. While Joni was often up in the middle of the night composing her album Blue (he called it a masterpiece) it caused the housekeeper to tell Nash “I just can’t stand it any longer. The girl making a racket on that piano at all hours. Couldn’t sleep. I’m quitting.” (in Wild Tales: A Rock and Roll Life).
Personal memory. When I was getting my political science degree from Wayne State University the folk club Chessmate featured the unknowns Joni and Chuck Mitchell for a bargain price to fill space between the current stars on other nights (various bluesmen, Paul Butterfield Blues Band, Tom Rush, Dave Van Ronk, Ian and Sylvia).
Joni Mitchell much later said on an interview show the small green room past the kitchen was where she composed Big Yellow Taxi and other songs while waiting between sets as a solo act after her divorce. The song was about the good side of her exhusband in retrospect.) Note: Bob Dylan went to that place after his second acoustic tour to unwind.
Joni wrote “River” about her breakup with Graham Nash.
IIRC a few years ago Joni basically called out Dylan as a plagiarist.