Good luck. What your looking for is called a Unicorn in the lifestyle world. There's a reason they call them that. Tough to find.
You can try Tinder. Have her set up her account for Female looking for Female. Be aware there's a ton of other couples doing the same thing.
You can try Tinder. Have her set up her account for Female looking for Female. Be aware there's a ton of other couples doing the same thing.