Put your finger in her about half way, move your finger is f you were motioning somewhere to "come here", feel for a rigid spot on the upper wall, maybe even bump..rub there at different paces while you are licking her cl!t.
agreed.
Also, move your body down a little so that you get a better angle with your fingers. It's hard to get deep enough inside her with fingers when your torso is high enough to kiss her on the mouth. If she is lying down, move yourself down as though you were going to kiss her breasts. Now you can bend your elbow and keep your wrist and fingers fairly straight, reaching deep inside of her without getting cramped fingers or wrist.