Typically when a cat who has always used the box starts peeing elsewhere, it more than likely will indicate a urinary tract infection or crystals. However, you have some outside stressors with the move and new furniture. I would still recommend a vet visit as the first step to determine if it's a medical issue. I suggest this because, if it is an infection, it's extremely uncomfortable for her and if left untreated while trying to address behavioral issues could become very serious.
If there are no medical issues, then I would try a different location for the litter box, maybe add a second box, try using Cat Attract litter (or they also make an additive that you can mix in your current litter). Also make sure you have cleaned the chair with an enzymatic cleaner to break down the urine. Otherwise she will consider it a good place to go since she's done it there before.
I will move this thread to Behavior for you.
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