Which way does she get confused? Does she do a slow when you wanted a quick, or more likely a quick when you wanted a slow?
Perhaps you could try practicing a series of walks, without rise, all slows. Then at random times, you could take the right foot walk with a bit of upswing and follow with left foot to side on toe as quick, then close the right foot for a second quick. After that go back to the series of slows. Might as well do it backwards too.
Also, make sure you don't have bounce in your SSQQ foxtrot. Some people use that instead of the progress of their body weight through the foot as a means of leading each step - it looks silly, and it won't extend to the SQQ figures. Since you'll have to learn the real way for those, might as well start leading with weight position from the start.