Dionysia, take a look at the first time Zen got a green. Our vet advised us not to shoot that morning, so it's not a perfect 1:1 comparison, but it's pretty close. I was terrified, but he popped back up after a few tsp of 10% carb food. (In fact, we over-fed him and he bounced pretty hard.) I bet Lisa is going to pop right back up with the food you've given her. Wait 20 minutes between all of your feedings and testings, but keep an eye out for symptoms.
And below is Zen's first hypo event:
Where it says 57, he actually dropped down to 37 later on in the hour, too. We gave him karo, some 10% carb food, and we even gave him a little bit of dry food (because we didn't know better than to give him dry food yet). You have tools. Just keep testing, watch for symptoms, and know that Lisa will eat if she drops too low. One of the great things about a cat going truly hypo is that they will almost always be extremely hungry, so you can control exactly what happens next with food. You've got your eye on her, you've got your LC, and some good higher-carb to help steer this cycle.
You've got this. Lisa is in good hands. Breathe and keep a clear head; you and Lisa are going to do great, and you're going to come out on the other side of this much more confident in how to keep her from going scary-low.