You were ok with her mentioning one candidate in her email? That seems worse to me than promoting the Kumba website.
Do you know if Kumba is going to endorse candidates? I have never heard of them, but she is telling people to check their website.
We have had private groups like this hold forums and then offer endorsements, like OPAL.
If this Kumba group is endorsing candidates, that would make it 100% non-innocuous.