She's an older cat. Older cats tend to change a bit over time. You may want to get her fixed, but due to her age it's a higher risk. Also it may or may not solver her spraying issues. When I was growing up and my mom had a bunch of cats, she use to put that foil down and when a cat walked in it, it's crinkle and make a noise witch they didn't like. Also they sell stuff in pets store that is supposed to work and deters then from that area.