Because she's .... private? Because privacy equals gay? Because no one is ever single? That's a bit like, "That guy's wearing pink ... I wonder if he's gay?"
Pink clothing for guys is making a comeback. It's not just for gay pride parades, lol. You can wear pink even if you're straight.
But if you also wear a flouncy hat, and wear a handbag we will all know the score, lol.