Myriad is included with various applications, your fonts probably came with software that she didn't install.
Instruct her to log into her Typekit account (free with her CC subscription) and download the rest:
(Note that the green buttons indicate free downloads, the blue buttons indicate you can purchase the fonts.)
Actually, that full list of Myriad Pro typefaces were not bundled with any Adobe product. Either those fonts were installed by you or someone else onto your system explicitly (either by licensing the fonts through Adobe or a third party) or you used Typekit to make those fonts available to you. If those font files are explicitly located in any of the standard MacOS font directories, they are not via Typekit, but rather explicitly licensed and installed.
Note that with Typekit, the fonts with the “green buttons” are not really “free downloads!” They are fonts that are synchronized onto your system as long as you have an active Creative Cloud account. You don't have independent access to the actual font files and when packaging an InDesign document, those fonts won't be in the package. They will however, embed in any PDF files exported from InDesign.
Ah, thanks Dov for explaining how TypeKit fonts work with InDesign (and presumably the other Adobe apps). I see now why an enduser who receives an InDesign packaged document that uses Typekit fonts had to subscribe to Creative Cloud to be able to load these fonts into the document. And how, of course , this doesn't effect a PDF as the fonts are embedded.
I;ve actually found that even PDFs come in differently when they don't have specific fonts on their system. This was very helpful.
Thank you Dov!