Nah, The weapons were designed to kill guardians. or at least have the capacity to kill guardians.
[spoiler]
"that weapon... is beyond special. A witness to the slaughter of our Founder. and my an ally in vengeance against those responsible. Lightbearers. just. like. you. "[/spoiler]
English
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Ah, I forgot that. Might also be why the vanguard may begrudgingly allow her to persevere, as they know very well about Dregen, the Shadows of Yor, the Warlords, and other infamous Guardian killers exist. And a time may come again when they may grow too powerful
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i doubt the vanguard are knowledgeable of her. Vanguard only moved here after the Red War. Ada had to close up shop due to the forges being overrun. so there wouldnt be much foottraffic to make any suspect.