Marina,
May I ask how old your daughter is? There are several using off-label for kids under 6. If the mutation is the one I'm thinking (i.e., it is a gating mutation for which the drug will work), then the soon she can get on the better. Maybe not under 4 but I'd start pushing at around 4 for at least 1/2 a dose. Also, they are doing trials now for 2 -5 year olds and once those results come out, if safe (even if not yet FDA approved, but in process), then I'd start pushing too. The idea with the drug is to get the kids before the lung damage starts.