As someone who has become wealthy through her own endeavours, I expect paid idleness will not rest easy on her shoulders. I would expect to see her return to proper paid work in the near future.
Of course Prince Harry is paid for by the taxpayer. It may be indirect (i.e. money from the Queen/Prince Charles) but where does their money come from? It used to be acknowledged as money from the Exchequer but now there is a smoke and mirrors thing where parts of the Exchequer (the Crown Estates and the Duchy of Lancaster) have been ring fenced and given to the Royals on the pretence that it is not public money. Oh, and when that happened they got a huge bump. Plus, anything they might actually need to buy (travel, clothes, security, housing, food, staff) comes from the Exchequer as "expenses".
I wish monarchists would just accept this reality and defend it rather than just recycle palace spin.