What to do when too much shortening is added to flour?
Your best bet it to divide the dough into two batches, freezing half for later.

With the half you are working with, add 1/2 recipe worth of all the other ingredients again, except the lard.  This will bring you into balance.

The tortillas may be somewhat tougher than you would get if they were made to specification the first time, but that will avoid wasting your ingredients.

Still, given that the ingredients in a tortilla are generally inexpensive, you may decide it is not worth it, and simply discard the spoiled batch and start again.