Yes you should. Blocking is a good tactic.
I don't doubt that but overusing it isn't really a good tactic
It'll reduce your life if you abuse it too much
And if she's blocking while standing, hit her while crouching or in the air
If she's blocking while crouching, hit her while you're in the air
If she's blocking while in the air, hit her with anti-air moves or uh.. just hit her while crouching or standing
Well the best way is to use unblockable moves.