That's not what I was thinking, but what I was going to say is along those lines.
If she's getting all mememememe and is butthurt about you not commenting on her physique, I have to ask: has she earned the compliments or not? Is she working out and making improvements just like you are (or alternately, maintaining an already stellar physique), or is she doing nothing looking average and expecting you to compliment her anyways? Because if it's the latter...you have nothing to feel bad about.