Legit forgot about her.
Honestly, in terms of visual clues: I think Dimitra is the closest visual match. She's older, the hair length (I'll note, given that there's been a makeover/disguise implied, I don't necessarily think hair style is the most useful clue), but to me most importantly, she's got the right waist. Joanna has a broader waist, while the mystery woman had a particularly thin one.
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That said, unfortunately visual clues aren't very useful in general just because of the context of the dialogue. Quite clearly, the woman is having fun at the inspector's expense that she's undergone a major makeover. Perhaps even surgical, considering that a few weeks has been enough to heal from even invasive surgeries in this story.
Being meta, I think the clues are meant to cause the reader to think it's Marina after going through a makeover (possible surgeries). We're meeting the inspector again, there's some teasing, and the last person we saw him with was Marina.
Is this because this really is Marina, or is this a red herring? For some reason we still don't know the identity of the blurred out woman. Especially now that we keep talking about the original wife, thematically it wouldn't be surprising if she showed up (although we might not get confirmation of her identity until later).
