How to follow the bill when the customer's home is dead?

I suggest that you don't mention it for a short time, and your contact will be reduced. Just call her and persuade her not to be too sad, just like your dead grandmother. Hehe, just put yourself in the other's shoes.

He thinks that you take the initiative to enlighten him, not for yourself at all, but sincerely share her worries. Then wait.

If he doesn't call you, you can call him later. But basically, he will call you on his own initiative, because she still needs software after normal work.