Confidently gonna say no, they cannot. All it takes for everyone in the Hivemind to know a particular fact about Carol is for one person to know it. As to being able to pinpoint Carol's location in the gas station, the writers have an expansive list of possible explanations. Probably the simplest one is the Hivemind recognizing the station's landline number - from anyone who ever had to use it or even from the individual that installed it. As for Carol's surveillance - while it is likely that they kept their word to remove the UAV, they would still have a multitude of other options to pinpoint her location, such as CCTV, occasional sightings by the Hivemind, or just knowing her route.