It seems like her soft skills are already masterful - more effective than anyone else. Why would she need another opportunity to hone them?

That's a vague promise here of better career prospects, but this company isn't really rewarding the difference (or telling us) in talent when she's already working for them.

Then it sounds like she's found balance in her career. She also has several valuable skill sets she can leverage to attain another position if her current employer does not adequately value her contributions.

It's hard to argue a person with technical competence and good interpersonal skills isn't going to be in higher demand than a person with the same level of technical competence and mediocre to poor interpersonal skills.