Nadir seems to be about +6 to +8, little hard to say for sure. I'm going to tag
@Bandit's Mom and hopefully she can assist.
Rough guidance, go with what whoever ends up helping you says - if she stays flat at +3, I'd give a little more LC and test again at +4.
If she's higher at +3, I'd hold off on food and check again +4.
If she's lower or in 50s I'd break out 1-2 tsp MC, food and test every 30 mins til flat or rising. Then a break from food if flat or rising, check in 30-60 mins.
If she's in 40s I'd give 2 tsp HC, test every 15 minutes til back above 50, then every 30 mins. 1 tsp MC when in 50s, HC if in 40s.
Any time under 40 I'd say 2 tsp HC and karo, test every 15 mins until above 50, then every 30 mins. Same deal as above...under 40 more HC and karo, in the 40s HC, 50s MC.
When you start getting towards +6 can be a little more conservative on the food; you still have awhile til nadir so I'm being a little more "aggressive" to keep BG up.
You have to keep testing until she's rising on her own after 2 hrs without food.