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Yes, and I'm pretty sure of that too - my questions were how much & how often...just maybe in actuality it was the other way around, i.e., she created the vocals and Rod made occasional suggestions...or, to put it another way, she decided how each song was going to be sung by her and he then created the orchestral arrangement to accommodate her plan...just a guess, but it seems to make sense, given her extensive experience and unparalleled skill as a singer.
Rod didn't "make occasional suggestions"; he did the vocal arrangements. As @newvillefan said, he created the background voicings for the stacks Karen sang. She sang them as he wrote them. We know declined songs of his she thought were "too funky" so she was making song choices, etc. But as far as technical musical arranging decisions and the like, Karen couldn't do that. She wasn't a writer or arranger. Phil and Rod already had a relationship because of the Heatwave connection so Rod was a natural choice. She wanted Billy Joel's band which Phil also had a relationship with. That's really all we can say for sure. Anything further would likely be conjecture.
Ed