Interview finally over, but still waiting for the result. No hint was given if mum got a visa or not. Told her she'll receive it from VFS by post. No question of overcrowding was asked. They asked my mom of my dad's work before he retired, and how he supported us. How they were able to put me in an exclusive school for girls and managed my college degree. Asked about his job, how much he was earning. They also asked her how many brothers & sisters she has plus nieces & nephews. So she answered them as honest as she could. They've collected all the emails and documents I've forwarded.
Now, the pain of waiting....not a hint whether she's refused or not, but I am thinking it might be coz normally they would tell you on the spot if you're approved or not.