Oh Catkins...How absolutely shocking for you and most of us just freeze when we are in emergency situations. You put her in the recovery position and that was crucial. You were on the spot for her and that meant that the alarm could be raised asap. You're not a doctor and she needed a defibrillator. The doctor-so fortunately- was there within an incredibly short space of time so life support administered by you wasn't absolutely critical.
Please don't give yourself a mental kicking over this? If you'd turned away and ignored her collapse thinking she was drunk wouldn't that be far far worse?