Cool, that gives her enough time to send all the remaining holdouts another round or two of email and also knock on those two house calls' doors again.

The one whose grandpa was there is home this time! "- what?"

"Hi! Remember when you tried that healing magic a few weeks ago? The Council wants some information on how well it worked. Can I ask you a few questions?"

"...you didn't tell me there was gonna be a followup survey thing."

"I didn't realize the Council was going to want one. It isn't mandatory, you can skip any questions you don't want to answer, I just have to ask."

"I don't want to take a survey or get any ads or anything."

Ah, the magic words. "I definitely don't send you any ads, and if you don't want to answer any questions you don't have to do that either. I'm just trying to find out if the healing had any side effects."

"It didn't. Go away."

"Alright, goodbye!" Off she goes. Has Bella gotten around to looking over her diagram yet?

Yup, she thinks it looks fine.

Great. Now, can she use it to enchant a rock to, when poked, recite the first incantation used on a different rock?

Depends on the incantation.

Fortunately she can afford to experiment, but the first version she tries is "Cause the rock that isn't glowing to produce the sound of the first incantation used to enchant the glowing rock, at sixty decibels, whenever a person touches it."

This gets her the recitation she expects!

One could argue that the responsible thing to do would be to immediately swap the glowing rock for the Tikbalang medallion and not do anything weird. One could also argue that the responsible thing to do would be to find out the limitations of her recording. She taps the rock, then taps it again before it's done reciting.

It completes its recitation straight through once as though she hadn't tapped it while it spoke.

Huh, she had kind of expected it to interrupt itself computer-style, but that's actually nicer. She gets a new glow diagram and checks that the rock isn't any more capable than her mundanely recorded voice of actually enchanting anything itself.

It is not.

Next test: repeatability. Can she get the same incantation from the same rock recorded identically on multiple other rocks?

If she draws out the whole huge diagram for each one, sure, she can make several different rocks say the incantation used on the glowrock.

She only does it for three total before disenchanting all of them; even duplicating and tracing gets exhausting pretty fast. Once she's established that one enchanted artifact can have its incantations read repeatedly, she swaps in the Tikbalang medallion and gets the first incantation used on it instead. Time for the moment of truth: how utterly alien and unrecognizable is it?

Well, it's definitely not a language she recognizes. It's a woman's voice, creaky and precise and bored-sounding.

Okay, that's definitely a human language with sounds her mouth is capable of making, which was not guaranteed and deserves appreciation. She also appreciates the precise pronunciation, though that's entirely expected--if she can't get this translated, one possible (terrifying) last resort is to memorize the recording and reproduce it sound-for-sound without knowing what it means. But that's a worry for later. For now, she puts that rock away in a carefully labeled bag and attempts to put the second incantation ever used on the medallion onto a different rock by the same process. There were four diagrams used on it, but she's prepared to find three, or five, or twenty-seven incantations. 

More incantations, all by the same lady. Seven in all.

Her email to Bella reads:

I got the incantations from the Tikbalang medallion. I can't send you sound files because I still haven't figured out how to get magic sound to cooperate with computers, but I'm going to try to make phonetic transcriptions next and you'll be welcome to look if you're curious. The weird thing is that it had seven incantations and only four diagrams, so either there's some ambiguity in the definition of a spell diagram such that I didn't get all of them, or there's some way to do runecasting other than "one diagram and one incantation at a time". Or something else weird is going on.