the wrong number

. . . my attention was on the younger generation and I forgot to look back . . .

M: she's not very well. She's got worse since you saw her at the weekend. She's transferred hospitals.

A: but she looked a little better at the weekend. 

M: I know.

A: Did she choose the wrong number?

M: what do you mean?

A: each path has a number. Did she choose the wrong path?

M: yes A, she did.

A: that's how people get ill isn't it?  They choose the wrong path.

M: hmmm. So how do know which is the right path?

A: you don't M. You have to guess.  That's why people get ill.