So, we see the skill set that Lemon brings to her job and shows that, a Fruit Sister or not, she's a lot more mature than Melon and knows the differences between objective reality and whatever subjective world she may occasionally choose to occupy! It looks like it did a lot of good for Roko and, honestly, from what I understand of the human equivalent condition, having an effective coping strategy ready to go under all circumstances is probably the best outcome Roko can really hope to have except in the very longest terms.
She's not wrong, you know...smelling salts work on the same principle and smells are often a huge factor in triggering memories which helps to shock the brain into focusing on other things causing the episode to end.
I suspect that Lemon uses that stuff as a shock to bring her patient out of their centring/grounding trance. As you say, it's also a very good way of reminding their brains that they are definitely connected to their body.
So... Vial of stuff found in a dumpster! Why it's a tube of Kerbal Space Program Mystery Goo
TM! That stuff is an invaluable scientific environmental condition test material! I wonder who dumped that test-tube of the stuff and how much trouble they're going to get in for losing it?
Also... Beeps? No. That way madness and possibly addiction lie.