Your outfit looks very glam, and the Hobbs dress is vile imo.
I think understated chic is always far classier than in your face prints. I'm not keen on the tunic, but then grey washes me out. It might have been better with tailored shorts and heels, but i do LOVE the trousers and heels.
Why not give your mum some positive feedback, in that you love the fact that she takes an interest in what you are wearing, but to tell someone that they 'used' to be glamorous is bloody rude and how would she like it if you said 'well mum, you used to look so young' !!!? I'd snap back a bit and see how she likes the criticism - depends on how well you get on.