Does she think it's an issue? Personally,I think Ambien is a dangerous drug to be taking all the time. But,if she can't sleep and hasn't increased her dose for a year,then this is her lifestyle. I don't agree with it either but I know insomnia can be just horrible.
There are other things she can take. If she wants to try it, suggest Melatonin and Valerian root. It's safe and it works for a lot of people. However,anyone on SSRI's should avoid Melatonin.