And what will that achieve? You already know that she has hypos every night, and you don't "wake up and dose" for your nightly hypos.
Since we have established that your mom has hypos every night, it seems probable that the basal insulin is responsible (if she injected too much for dinner you wouldn't expect it to happen every day) and you should either reduce basal insulin or add a small bedtime carbohydrate snack (depending on what insulin you are using).