I think giving Frost barbed wire would be a decent buff for her without needing to change her kit.
If you place a Welcome Mat in barbed wire, it makes it significantly harder to see, while not camouflaging it completely. This works well with Frost as her traps usually stick out and are very noticeable.
However, she doesn't have wire in her loadout. She has shield and camera. So, I think Frost should get barbed wire as a gadget to make her not such a weak operative.
I doubt it'd be too broken, as if you know they have a Frost, you can just look carefully at barbed wire or break it all together to make it visible.
I'd just like a semi-small buff for her honestly.