Definitely sending a mixed message to/about Romney.
If he allowed her to go out on the news programs and talk about the supporters being upset about Romney, just what is he trying to say?
If he did not, and is covering for her now, what does that say?
The whole thing is weird.
FWIT, I think Trump was surprised by the strong opposition to Romney. Remember, Romney not only trashed the candidate, but also spent some time trashing his "sucker" supporters. Additionally, their international worldviews, including global economics, don't appear to be a good fit.
Mike Huckabee was actually the first to talk about this opposition---and there was no public reaction from Romney.
Kellyanne may have been given the green light to talk about this opposition (the "trashing") in hopes that Romney would at least address the speeches/comments he made and actions he took against the candidate through both the primary and general election campaigns, or voluntarily withdraw his name from consideration.