I notice that Karen is like Morgan Myles in the sense that they both are seasoned performers whose styles can potentially appeal to Minivan, but the fact that they are women over 30 make things harder for them. The main difference between would be that Karen has a defined identity, she has it clear that she is country and nothing else, while Morgan tried to tackle other genres like pop, and that probably affected her appeal. And also, Karen has the advantage that there is no Blake this season. Yeah, Reba is probably more popular than Dan + Shay but she doesn't really have, at least not yet, Blake's voting power. If Karen plays her card rights, anything can happen.
(And yes, i know Morgan is obviously a better vocalist but that is not that relevant to my point tbh)