Some is physical compatibility-I couldn't be on top with one guy because he was too damn big, plus I have lousy rhythm anyway . Doggy style is really just a matter of position, maybe her hips need to be higher toward you, ie; she would rest on her arms, ass way up. I've found lying flat not to work as well.
With missionary, have you tried her knees bent flat to her chest? That feels good and there's less 'slippage'.
Many times, younger and inexperienced women don't realize how much they have to contribute to the 'thrust', having to synchronize with the guy; instead they leave the work to him and that too can cause things to not 'fit' and slip.
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