Miralax = small poops all the time?

This question is in regards to my 2 year old who is on Miralax due to serious constipation. She has been on Miralax already for 6 months and all this time she has been pooping small poops all the time (like 6-10 poops per day). Doctors said that we should raise the dose to max dose which we did but it didn’t get better, we have also tried lower dose but it didn’t help either.

I just wonder if anyone has experienced this to understand whether the medicine doesn’t suit her or if she is withholding and that’s why only small amounts pass through?