I'm glad you got this off your chest. What a read! Seriously, relatively small windfalls are the perfect opportunity to show a loved one that you love them. A random wad of money fell into your lap and the first thing you did was think of doing something nice and unnecessary for the woman you love. Full stop.
She won't admit it, but I'm sure she understands exactly what you did and appreciates you immensely for it.
Good. For. You.