The phrase "under her nose" usually means something that is obvious or visible but has gone unnoticed. There are several synonyms that can be used to replace this phrase. One of them is "in plain sight," which means something is right in front of someone but not recognized or identified. Another synonym for "under her nose" is "within arm's reach," indicating that the object is near and easily accessible. "In close proximity" is another similar phrase denoting something that is within a short distance but overlooked. Lastly, "almost at hand" implies that the item is just a step or two away from being discovered.