Shade
So, if you get a client who shakes her head at every single card, over multiple spreads, do you feel like she's not open to the reading? Do you feel like this person is in denial? There is no way that through 4 spreads nothing aligns or makes sense...
In this case WHAT DO YOU DO???
You can say something to the effect of. "From that gesture it seems you aren't resonating with what I said." If they tell you "You're wrong that doesn't sound like my job at all." you can give it one more "good college try" and rethink the cards or your narrative and look at the most basic definitions you have for those cards. If that still doesn't work it is probably best to say "It sounds like I might not be the best fit for you as a reader."
This does not make you a bad reader. Amazing readers are still not the best fit for some clients.