Those aren’t counters.
Cav negating Jackal’s tracking is a counter, Jackal tracking any operator is just what he does.
Counters have a way to negate or take advantage of one’s gadget. Ela’s mine only is countered by Zofia, while Thatcher and Twitch can take them out but there are ways to hide the mines to where they can’t be taken out. Also don’t mention shields. That’s not something specific to one operator and to be frank they are either easy to takeout by flanking (with that 3 speed) or get a lucky kill.
And her mines are amazing. Unless you have a way to take them our beforehand, are a guaranteed handicap for the attacker while Ela runs in and shoots you.