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Satellites in orbit CANNOT change their orbits dramatically without large amounts of fuel. This is a "laws of physics" thing, not a "we haven't thought of a better idea" thing. You can make very minor changes to improve a satellite's look at a specific target, but those changes have to be carefully considered lest you screw up a planned look at another target down the line or take a bunch of time off a satellite's life. Refueling would be nice, but it doesn't seem to be happening, yet. We know because there's a whole community of folks who track military satellite launches and maneuvers. They have a really good track record of seeing even sats that are not publicly discussed. They would know very quickly if a new launch (e.g., a tanker) had come close to an existing vehicle.
Satellite inspection would be a pre-planned evolution, with a vehicle launched directly into an orbit very similar to the satellite to be examined. CMs could include using delta-v to avoid the inspector but you'd have to weigh that delta-v expenditure against satellite lifespan. And the inspector would have to deal with the fact that they are spending literally tens to hundreds of millions of dollars just to see what a satellite looks like.
