I was thinking. I know, weird event
Anyway, what I was thinking is the following: your mom has softened a lot in these last difficult months, about your birds and your attachment to them, and the whole idea of keeping and loving birds as a very worthy activity.
But the fact that she is the one who will drive you to Susanne's will probably show her new aspects of bird-keeping, like a more "scientific" approach, the organisation, etc. etc.
I don't think your mum will see cockatiels and cockatiel-keeping with the same eyes ever again.
I think this is great!