> The Entitled > being a Senior Staff Engineer enables her to do something that cannot be accomplished as a Staff Engineer

I think it is not an issue with being able to do something. I believe the reasoning is something of the sorts of "Being just a Staff Engineer, I'm not doing X because I'm not payed enough to do it" or "it is not my responsability", while being a Senior Staff Engineer has a bigger pay and more responsabilities. In my opinion, it is a perfectly valid stance. Someone should just talk to this engineer to clear up any ambiguities.

And I totally agree with santacluster's comment.