Does Morwinyon know about her mother's involvement in the Fëanor stuff and how does she feel about it?
Thanks for the ask, Sarah!
Morwinyon knows that her mother is a scion of Fëanor (and therefore Morwinyon and Legolas are too) but even Legolas was born after all the Feanori stuff happened, and Thranduil and the silvan told mostly complimentary tales because everyone involved is biased. The Noldor that went to Mirkwood with Laeriel didn't have much to do with the kid that (to all appearances) mostly stayed in her room, and as you find out in the one instance of Orvaië's PoV, some of them aren't super pleased that Laeriel married a Sindar either, so her (slightly more than) half Sindar kids are kind of... eh? To them.
So all of this to say: Morwinyon had a sanitized version of her mother presented to her growing up and isn't even aware that Laeriel was involved in Inheritance Question Shenanigans.