I have sat on both sides of this issue.  As an owner who received the bad news that someone was leaving...and as a booth renter that knew I needed to move on and had to give notice.  It's isn't an easy decision, but I firmly believe there is more negative energy created in a salon when someone stays who, in fact, has already left.  I sold a salon and continued to work there for a few months.  She and I are totally different people and she redecorated in a way that I found totally disgusting and embarrassing.  One day my son came in and I said to him, "look what she has done to the salon.  It's hideous!!!"  He very nicely told me that it wasn't as bad as I viewed it, BUT what was bad was my attitude!  He told me the BEST thing I could do for her was to leave.  I can say without reservation that it was.  She was very upset when I left, but it allowed her to move in a completely different direction and she is successful.  You can only be responsible for your own career.  All relationships have seasons.   You might be surprised that your leaving is exactly what motivates the owner to re-invent her salon OR know it is time for her to sell.   You may actually be the catalyst for the change the salon needs.  Best of luck to you.