Reddit mentions of Articulating Design Decisions: Communicate with Stakeholders, Keep Your Sanity, and Deliver the Best User Experience

This book might be what you're looking for.

Articulating Design Decisions by Tom Greever may be what you're looking for.

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If she's interacting with a lot of users I would suggest reading Practical Empathy. Observing the User Experience is another great resource for learning about user research. User experience is all about people so it's always a good idea to read up on human behavior, psychology, cognition, perception, learning and memory etc. e.g. books like Hooked, Bottlenecks, Design for the mind, Designing with the mind in mind, 100 things every designer needs to know about people, 100 more things every designer needs to know about people, Thinking fast and slow, Predictably Irrational and I would also recommend Articulating design decisions and Friction.

Read Articulating Design Decisions. It offers great advice on how to talk to stakeholders and different members of an organization.

In the meantime, I can tell you that people respond positively to slide deck. Lean on your presentation skills!

Before a client meeting or review, put your ideas into a deck. It's a much cleaner way of sharing ideas or updates, it looks much more professional and authoritative, and it helps you get into a natural flow so you can make sure you hit all of your talking points.

Plus, whether your meeting is in person or remote, you can easily email your work out to get feedback later.