smile more
and
take deep breaths before you respond to anything she says

I think it comes down to making a real effort to not take anything she says as a persoanl slam...even when it is...

find something to compliment in her parenting technique
(I love how when you were trying to medicate son, you didn't spit on him or anything!!!)

you know

the basics

treat ehr like you work for the same company and have the same job and even though your styles don't mesh you still have to work together because your boss is watching