Asta'lin is a crappy empath: she receives like she has interference and only broadcasts if she's really worked up (and then it's just a tickle on your brain, a mere wonder why you're a touch worked up). So this means she'll realize when she's being watched, but often have to figure out why she gets certain feelings and intuitions. Usually she thinks the Goddess is trying to tell her something, other times she might try to figure out what she might have been thinking.
She's also not very attractive and has resting-bitch-face as well as a jaw of rage. Normally people confuse her for a Templar from behind due to her size and clothing choice, but at the right angles her only feminine "assets" can draw attention instead...
Asta'lin is a cameo that will appear in Chapter 49 of
. Here is her concept art