You can escape it and punish her with anything if you time it right (easy).
I'm afraid there is no easy way to do the doom combo.
But if you understand how it works, it will be much easier to get the combos.
Like when to release "fast" or slow", when not to C2B at all.
In most cases you'll have to do the opposite of what you did with your last C2B.
So if you land a "fast" C2B, you'll almost always have to go "slow" for the next one.
For example you can start 3 A hold "Fast" OR "slow", if you start "fast" your 2. C2B would have to be "slow" and vice versa.
I also think it makes a difference if you do 22B or 88B, it probably depends on which foot is in front. (22B sucks)
Btw, Hildes power depends heavily on the doom combo, if you can't do it consistently (which nobody reallly can) she's not that great.
She could be even A+ or S tier with godlike execution though.