Aside from Isaacs as the Captain, this is the first casting on this show I really like.
The only problem is, she looks and sounds quite young (but that's probably for flashbacks). They'll have to age her up a bit to make it believable that she has a 26 year old son if she ever appears in 2256.
No doubt they'll introduce 'boy Spock' in flashbacks next, whenever they need a viewership boost.