If your girlie is build small, basically the previous advice: making sure she is "prepared" and properly aroused and starting in another position are good, and here's why. Basically, during sex, slightly after initial arousal, during the "plateau" phase, the vagina actually expands right around the certix, extending the depth by quite a bit. You and others mentioned some psychological factors as well, which should be explored, and none of us know her as well as you. ^_~
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