grammar - Reported Speech

I am correcting a reported speech test. I am more than familiar with the backshifts and exceptions. However, I would need some help to see if I can accept these two reports:

1. "We can't protect our planet if we don't stop littering."
   = She told us we couldn't protect our planet if we DON'T stop littering.




2. "We must work harder if we want to make a difference."
   = She told him they had to work harder if they WANT to make a difference.