Sexism wasn't really that big of a part of Trump's campaign. It was mostly racism and xenophobia. Hillary's campaign was largely about her sex.
Hillary using her status as a woman as a campaign strategy isn't sexism, though. It's a fact that there's never been a woman president. It's a fact that women have been oppressed historically. It's a fact that not that long ago women couldn't even vote or become senators. It's significant then that she was a woman, and it would have been obtuse to ignore that.
All of these things have significant political merit and pointing them out or using them as a part of your strategy is not sexism.
It would have been sexism if her strategy was more like "don't vote for a man", or "he's a man, he doesn't know what he's talking about".
Women have held positions of power for quite some time now, including being leaders of countries and CEOs.
The "shock" value of "wow, a woman!" wore off years ago. She's not accomplishing the unthinkable anymore. ---
"I think that man will be president right about the time when spaceships come down filled with dinosaurs in red capes" - Tom Hanks