In the play pygmalion act v, what does mrs. higgins think about liza throwing higgins's slippers at his face? she thinks that liza was a bit over-emotional. she is angry with liza. she doesn't believe liza would do such a thing. she thinks that higgins deserved it.

I would say the correct answer is - she thinks that Higgins deserved it.
Here is a quote from the text to prove it:
"And then you were surprised because she threw your slippers at you! I should have thrown the fire-irons at you."
You can see here that she wasn't mad or surprised she did it - it was to be expected. 

I think its A.Point of view or take on the subject