If your friend was LADA (latent autoimmune diabetes of the adult), she would not be able to concieveably take oral diabetes medications as they are more towards the type 2 diabetic (glucophage/metformin, actos, can be taken by type 1's).
Glipizide is a medication that forces the beta cells of the pancreas to produce more insulin. In LADA, the beta cells slowly, die off as in type 1 (takes 2-4 years or so vs normal type 1 when it is weeks/months).
So No she would not be able to take glipizide, but the peak plasma level is in 2-3 days.. therefore can NOT be used as a "bolus" medication.
Kitty Loves
type 1
Deltec Cozmo 1800 with cozmonitor (purple in colour)