Nor does it address the issue that Angelique died a mortal in 1840RT (making a materialization in 1897 as a witch questionable).
But Angelique was time jumping, you see. She did not go from 1840 to 1897; she was sent back to 1795 from 1968 and killed again in an alternate time line where Barnabas traveled back there to save Victoria. In 1840 Julia seems to find herself in the progression of the original timeline rather than the altered one.
What they failed to explore, due to the cancellation of the series, is the implications of Barnabas and Julia's time in 1840. They essentially wiped out the post-1840 history since Edith got killed in the revised timeline and wouldn't have been the matriarch in 1897 because of that. It would have been fascinating if they'd pursued this, for Julia and Barnabas should have found Collinwood in 1970 a very different place indeed upon their return from 1840. Because of their interference, Elizabeth, Roger and Carolyn might never have been born at all.
I must agree with Vlad that I studied the 1840 dialogue carefully to determine whether Angelique was meant to be a reincarnation of Miranda or Miranda herself and they were clear in their intention that Angelique
was Miranda. Conversations between Angelique and Judah Zachary, while he possessed the body of Gerard Stiles, are pretty distinct in illustrating this.
As I said earlier, we of course know that by the 1840 story line the writers were merely taking artistic liberty and re-writing their own established history at this point, but whereas they had been explicit about reincarnation regarding Lady Kitty in 1897 they were equally explicit about Angelique actually
being Miranda in 1840. It was a back story on how she'd first gotten her powers, and from whom.
Despite my admiration for Lara Parker I have to disregard her interpretation of events in favor of what we actually saw on the TV show. As Vlad points out we see Angelique resurrected numerous times; there is a distinct difference between reincarnation and resurrection and Angelique qualifies only for the latter so far as what is spoken and what is implied.