The palace hasn’t issued a new announcement, it’s just the media use the terms interchangeably.
i also think she will be back after Easter, she needs to be not sore, able to dress as she normally does (ie nothing rubbing on a scar) doing her work is very time consuming, pre briefing, hair, make up, clothes, travel, and she will be utterly scrutinised when she appears, with Saddos trying to identify what she had done. So she needs to be 100 percent back to normal.
people will be looking at her face, does she appear uncomfortable , her body, has she gained or lost weight, how she dresses, is it the same or different, does her style of clothing give anything away, how she moves, what shoes she’s wearing. It would be unbearable for most.
personally my opinion is she needs to stay out of the public gaze till she’s back to normal, as the attention is going to be enormous.