Okay, I know it says it works once per day...but is it me, or could a case be made that, as written, it can actually be used an unlimited number of times per day without contradicting that?
Consider: the amulet resets time to the beginning of your turn, moving creatures, removing damage and other conditions incurred, and "in all other ways "resetting" events."
Using the amulet is an event, and as such, would logically be reset.
Ergo, the player should be able to use it again...and again, and again, and again...and still technically only use it once in the day (since all of the other uses were undone and never actually happened.)