because she is a hypocrite who uses her children as political props and nothing more

Palin's campaign against the "R-word" hits snag with Limbaugh
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Again, no surprise here - she wanted to make political points by bashing a private conversation that Rahm had, but she can't bash Limbaugh for publicly saying worse things because that would offend her hypocritical base.

It has nothing to do with her being offended but it has everything to do with playing politics with her special needs child, which she has done since she first appeared in the public spotlight.

It is actually pretty revolting that she obviously cares far more for her political career than she does for her children.