The comment that was liked says to "vote her if not Trump", it doesn't say to vote "Trump if not her".
A very important nuance. A more charitable explanation is that she is trying to get undecided voters. Which is exactly what a presidential candidate is supposed to do.
We have long passed the point where lobbying and bribing were just doing your fiduciary duty.
And indeed, it seems we are back to feudalism and you have to pay tribute to the divine king and kiss his ring.