You could use the Logging Tool, that comes with the resource kit, to do capture logging. Then you would have to take this log, which will be huge, and sort it some how. Select SIPSTACK, if you do this.
You could look for Disconnect and match it up with the calls she says get disconnected. If it showed an expected disconnect, it would point to, but not guarantee that it was an accidental click. If it showed some sort of error instead, you could then determine
that it wasn't the accidental click and then go from there.