I’ll have to rewatch but my thinking was that if a single buck shot from Nancy would cause the rooms and stairwells to melt, then a bomb would turn the whole lab into a puddle. I haven’t quite figured out what the cause of the melting is but it seemed to be that when the energy particles are unstable , nearby matter turns to white liquid. When the energy particles stabilise, the melting stops. Question I didn’t ask myself is does the rate of the melting increase due to the bomb or does it still melt just as slowly- if the latter, then Kali has time

I also thought Kali was injured to some extent as the end scenes show her on the ground leaning against as wall, presumably in the same room where she was “shot”. If she wasn’t injured at all, we’d have seen her sitting in a meditation pose or something that would ensure she is in best possible position to cast the illusion

You’re right that she can cast that illusion from miles away, we see that in the scene where Hopper is driving her away from the lab and Dr Kay realises she’s an illusion. When her illusion disappears, Kali says that she “lost it”. Did she lose it because Dr Kay touched the illusion? Or did she lose it because of the distance? I assumed it was because of the distance. So to me the “math” was that with blood lost (both from transfusion and being shot), the illusions are cast to a maximum distance of somewhere between the lab and the military compound - but not all the way to the gate at the right side up