The no-answer gets their address written down to be pestered again later; the grandpa gets asked with careful enunciation if she can speak with his descendant so-and-so. 

"What's all this about? Who are you?" says the grandpa.

She repeats the descendant's name a couple more times, and reminds herself that she should start designing a de-aging spell.

"He's not home."

"Okay. Goodbye!" That's two for the pester-again-later pile, but for now she can go home and collate results. Has anyone reported anything resembling a negative side effect? Or, for that matter, an unexpected positive or neutral one?

One person is not sure whether needing to have a filling redone had anything to do with it or not.

That's pretty reasonable, since she isn't sure either. This is probably enough to bring to the Council; do they have a phone number or a website where one can make appointments?

They have a phone number. The person who answers gives her a time slot eight days out.

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.