As Inquiring Minds mentioned she needs to move around while in that position so that you go in at the right angle. Or you could change your position. Mybe have her close to the edge of the bed with you standing or both standing with her leaning over. Anytime there is discomfort because of deepness, she can just try changing her hip angle until it doesn't hurt. This works for any position...lifting and lowering the hips also aids in the pleasure I've found. Happy exploring!
