I posted a question about our chihuahua cross the other night, she survived the night but sadly collapsed and died in my mum's arms. Everyone is heartbroken as she was only a year old and such a lively, friendly character. As she was my mum's dog it was harder as she died with her.
my thought are also with both you and your mum. But I have heard that doggy heaven is a lovely place. My cat went there with the sole intention of tormenting as many dogs as he could.
Really sorry about your loss...I have four Cavaliers, they are 12, 11, 10 and 6...I dread anything happening to them but would prefer them to pass away at home and not have to have a "needle" at the vets. My thoughts are with you. K