Evelynn's stealth indicator is not accurate (the ring around her character when she enters stealth)
A lot of my fiends complain that enemies could often see them way before they enter the ring of detection indicator. This is frustrating since carefully managing your distance and perform a surprise attack on the enemy is so crucial for Eve as a champion.
I suggest either decrease her stealth detection radius to match the indicator or increase the visual size of her ring to match its actual detection radius.