Have you thought of trying using the distraction of the sniffing which she loves, as the reward? So turn it round, rather than try and call her away from sniffing; call her to you, then say "go sniff" and make the trip to the sniffing spot real fun?

On the proofing & dog not listening, whilst it's true; It's probably got some good reasons for it, especially in "family" dogs, rather than those with expert highly motivated owners.

Mistakes I make when relaxed and having fun out & about, are unclear garbled cues; occasionally I even say the wrong cue, and where it's stupid, I can hardly blame the dog for a "come again?" puzzled look. At other times, he's figured out something new, by generalising a command to a new situation, so if you do this, shutting up and letting the dog work it out, might work, rather than babbling a "whoops!" and interrupting the canine problem solving.

At times to, someone else has affected the dog, so you need to make it easier; or you misjudged the distraction level.

We learn not when we are 100% successful, but when we are unafraid to makes some mistakes, but then respond by addressing the exposed weaknesses; this is an essential attitude for success in competitive technical sports. The variable reinforcement idea, becomes useful according to the experts at 80% success rate and speeds reliability, so avoiding failure too much would be another handler error.

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For eager & reliable recall, be fun for the dog to come back to! Then often send them off right away to do what they wanted!
DT&B - Glossary of acronyms & jargon terms.
Encouraging good behaviours, whilst consistently avoiding practise of bad alternatives leads to extinction of the bad. So if dog sits 6/10 times it doesn't sit 4/10 times, encouraging with the right rewards (positively-reinforcing) enough for 9/10 times means it now fails to sit only 1/10 times, sit 10/10 means...

I was always taught, when a dog returns to you, get your hands on him and at least stroke him along the back once. Increase praise depending on the quickness of return. So quick return high praise - slow return, just a quick stroke of the back. Even if he has ignored you and gone on walk about.

Me either, this is a general question for general discussion and hopefully simplifies the R+ /-P debate going on, on other threads. By sticking to simple answers.

Well if you're in the punishment/negative-reinforcment camp, maths & logic does not support your case, so I can understand that urge.

The maths is easy - Simple Proof that positively-reinforcing a behaviour simultaneously negatively-punishes (diminishes) alternative behaviours.

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For eager & reliable recall, be fun for the dog to come back to! Then often send them off right away to do what they wanted!
DT&B - Glossary of acronyms & jargon terms.
Encouraging good behaviours, whilst consistently avoiding practise of bad alternatives leads to extinction of the bad. So if dog sits 6/10 times it doesn't sit 4/10 times, encouraging with the right rewards (positively-reinforcing) enough for 9/10 times means it now fails to sit only 1/10 times, sit 10/10 means...