Why does this family member always end up judging me?

I work as a home care nurse for a disabled child. I take care of him at home and bring him to school. The disabled child's adult cousin comes in once a week, to inspect the child's room (she's not the primary daily caregiver). One time, she spotted the child receiving a feeding from the machine while child was pooping on the toilet. This upset her. But this was something that was done by her mother (who was the DAILY and primary caretaker of the child). So then she instantly didn't like me since that day onward. A few months passed by, I did a good job with the child. No complaints.

Then today, she got secretly upset with me about something else: the child's school bag didn't contain another full change of clothes (undershirt, sweater, belly wrap, diaper, pants) into the child's school bag since the child was prone to having leakage issues at school.

Again, HER OWN MOTHER didn't think it was necessary for me to even bring his school bag to school for today because it was going to be an extra short school day. The child was going to be at school for LESS THAN 2 hours!!! why would it be necessary to bring a whole another change of clothes? That was why I didn't bother putting in a diaper and new change of clothes into his schoolbag ONLY FOR TODAY!

Now, she doesn't like me even more... She didn't talk to me about it but I can tell she doesn't like me from her facial expression. I don't know what to do with this lady... I don't know if there is something wrong with her... or am I just a fuck up? I really don't think I'm doing anything wrong.

Why does this family member always end up judging me?
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