Her behavior will tell you when she's in the clear on any remaining egg material left inside. Once she's behaving like her old self, chatty, active, interested in being in the flock, and good appetite, you'll know she's recovered. Then you can stop the calcium. The calcium and antibiotic are mostly preventative for your patient. This treatment is "in case" she needs it. Not to do it opens her up for possible chronic infection and sterility. We're doing it so that doesn't happen to her, taking into account her recent history.
There's a thread this morning about a hen like yours who had soft eggs a few months ago and this went untreated. She now has a chronic infection that's probably too late to treat.