Your HR lady doesn’t know what to do when she assumes a position of power. She’s either too tough and acts like what she imagines a dude would act like, or she wants to be liked and asks for buy-in from her colleagues.
If I had to make a choice — and it would be a false choice — I would advise you to stop asking for buy-in.
Good leaders are inclusive well before decisions are actually made. And leadership requires a spine. If you are asking for buy-in, you’re not a real leader.
So never ask for buy-in.