Apart from two very potential places another is Gspot which is little inside the vegina and can be stimulated by one or two fingures.Moreover arousal can be made by many personal ways which your spouse likes much. She may like to come over you or some oral stimulation. It is a combined efforts makes the thing fine. It will be more stimulative to her if she takes some initiative to play the active job instead a passive thigh parting partner.
Playing with her nipples and breasts usually will help with arousal in a woman. Also find the clitoris which is located at the top jucture of the outer lips. Its a small button like piece of flesh that when stimulated can produce orgasms for a women.