I agree, and I think she'll take it extremely badly.
I think Zayn is a bit of a false equivalence because, by all means, he's chosen to take a step out of the spotlight. He does minimal promo, he doesn't tour, and appears to be making the music he wants to make but that never tends to set the world alight (moody, lowkey R&B). His comments about disliking One Direction's music never riled me the way it did some people, because the music he makes now couldn't be much further from their stuff - even his biggest, poppiest hits would be massively out of place on a 1D album.
Jesy, on the other hand, clearly *isn't* the shy and retiring type. She'll want to do the promo, she'll want to do the big tours, and she'll want to shed the Little Mix image and be seen as 'her true self at last'. Problem is, LM's discography is about as eclectic as you can get in pop music - she'll likely try, but she can't believably state Little Mix's music "wasn't her" in the same way that Zayn could.
I expect buzz around the first single because of her name (and, tbf, it's likely to be a good song - I bet a lot of talented people will want to play a hand in her first single as they know it'll attract attention), but after that I think she'll struggle. She's already shot herself in the foot and lost some goodwill through her actions. Some people who did want her to succeed have been put off by her attitude towards LM.