It's no longer liked by her. So, I'd agree it was likely accidental, or she thought better of it? That said, I get the feeling they (Lizzy and she) aren't that close anymore and it would not surprise me in the least if she did privately agree with this reviewer. As getawaywith it said, why would she be reading the negative reviews? Schadenfreude? (That does ring true doesn't it) I noticed when I looked at it that this reviewer also lives in Norwich - which hmm.
I doubt she would so openly burn a bridge with another influencer in her circle. She's a bit more sneaky than that, more of a possible duplicitous frenemy than a straight forward "I don't like you" kind of person I reckon.