Given that these are the same criminals who insist on throwing the gun when it runs dry, and who always aim for the chest, I think she's safe. Now, launching a few grenades would get her attention, I'd imagine.
Why specifically the ankles? Wouldn't the natural assumption be that those boots she wears have some sort of high density bullet-proof fiber in 'em? I mean, she's Greek after all; you'd think she'd have heard of what became of Achilles...
More importantly, why do people think that shooting her is gonna hurt? I mean yeah, she's not "invulnerable" to piercing weapons, but so what? She's been punched by freakin' Superman in serious fight, and she can move at speeds of up to Mach 5. The only reasons she bothers with those bracelets are:
A) They're a gift from the heavens
B) Blocking the bullets is good practice for staying in shape, and
C) It intimidates thugs when they realize they can't get past her guard. Yeah, you know how there are always those gun-nuts who say "All that Karate or whatever can't do crap against a bullet!" Yeah, they're usually the ones who are shooting at her. Like, oh hey, here's the dumb broad who thinks she's hot stuff just 'cause she beat up that one super-strong dude. Let's shoot her with pistols that couldn't break a riot shield!
Anyway, even if she couldn't avoid the bullets from where she was standing, it still wouldn't work. All she'd have to re-position herself so that the bullets don't hit her. That include's sidestepping, crouching to put her lower body in blocking range, and possibly hovering horizontally so that the only place you could shoot was her face. And then there's the fact that she could simply put that Mach 5 speed to use and knock those thugs out.
Guns just aren't going to work on her. The only people still dumb enough to try and use them are the same idiots who'd shoot Superman.
Actually, there was that one superbad, Black Adam, who's flight, speed and strength were on par with Superman. Like Supe, Adam could stand being shot by raining bullets and not budge, but it took a magic bullet to his gut for him to bleed like a normal dude. So...Wonder Woman's bracelets maybe magical, but that just means you need magic bullets. Those totally exist in DC Comic Universe.
he, along with over a dozen other highly-trained, highly-equipped, gunmen, added a little red to the overall white landscape of Antarctica, courtesy of Black Adam's vengeance. Still, if one magic bullet can make an ubermensch bleed like the rest of us, then what will a full magazine do to the likes of Diana and her bracelets, eh?
That depends. Her body may not have Black Adam's durability, but those bracelet's have taken and deflected everything from basic arrows to small missiles to Darkseid's Omega beams. They're defined as indestructable, and there is no case that proves otherwise.
More importantly I believe that you're too focused on the fact that Adam bled and not focused enough on the fact that he didn't die. That's like celebrating for scratching someone's cheek with something after they've literally pounded you into the pavement; not exactly the moment to be thinking about how easy it would be to kill someone marginally weaker than him. Sure, Wonder Woman is not exactly as over-powered as Superman or Black Adam, but that doesn't make her the farthest thing from it.
And then there's the fact that even if something could actually harm her it would do little to slow her down, and if it could critically injure her she'd have the sense to quickly notice and adjust her battle plan accordingly. Yeah, I know that sounds like BS and all, what with the stereotype about how heroes stand there like a dumbass just letting the villains throw whatever at them, before crumbling helplessly to the floor after they got hit with their own personal krytonite. However, what most people forget about Wondy is that whereas Supes is a boyscout and Adam is basically a berserker, she happens to be a born and bred warrior, trained and primed for combat. She's not some glorified piece of Angel's Corps fetish fuel (look up Sinn4u on here if you don't know what I'm talking about.) She's been in several situations where she was severely handicapped and had to use her wits to get out. She's not going to get offed by the Toxic Mega C*nts because Chris Genovese bought them all a truck-load of hocus-pocus powered artillery. If you wanna take her out, you'll need a sight more than a magically powered weapon. Probably flowers and a coupon to Red Lobster would give you better odds...