Is Lady Macbeth an ambitious woman who fails to see the consequences of her actions or a noble woman who acquires false courage for her husband?

In Shakespeare's Macbeth, I suggest that what Lady Macbeth fails to see isn't the consequences--I think she's well aware of them: 

• eternal damnation, according to the prevailing religious beliefs of her day, which her husband worries about but she doesn't--she calls on evil spirits to help.  She apparently doesn't subscribe to the belief system popular in her day, and


• the possibility of being caught, which she accepts in Act 1.7.59 when she responds to her husband's asking what happens if they fail:  "We fail [?] or [!]:  the punctuation is left to interpretation, here.  Either way, she knows the possibility of failure is there, with consequences to follow.  She simply thinks they can get away with killing Duncan, or is willing to take the chance and suffer the consequences if need be. 

And as far as the act, itself, of killing a king, she knows the magnitude of such an act.  She just doesn't care.  She is willing to do the act, or at least to have her husband do it, in order to gain power. 

What Lady Macbeth fails to see is her husband's stupidity, and his willingness, once he's done the deed of killing Duncan, to veer from her plan.  She fails to see that Macbeth will kill the grooms, casting suspicion upon himself.  She fails to see that her husband will shut her out and start planning for himself.  She fails to see that he will become a tyrant and order the killings of Banquo and Fleance and Macduff's family.  Macbeth brings about his downfall with his excessiveness.  He raises suspicion and leaves fellow Scots little choice but to rebel.  She thinks her plan will work, and it probably would have if Macbeth would have stuck to it. 

In short, if you consider her husband's stupidity and coming independence as consequences, then, yes, Lady Macbeth fails to see the consequences.  But if you're thinking of traditional consequences, I think she's well aware of them. 

Concerning the second option or second part of your question, I suggest you need to rethink it.  First, the two options you offer are not mutually exclusive.  She could be both.  Secondly, one person cannot "acquire" false courage for another person.  She might be able to "give" him false courage, but she cannot acquire false courage for him.  That's impossible. 

Again, though, your two options are not mutually exclusive.  Lady Macbeth could fail to see the consequences, however you define them, and still give her husband false courage.  Her plan may well have worked, though, had Macbeth not messed it up. 

And by the way, "noble" probably isn't a word you want to use to describe Lady Macbeth.  You can make a case for Macbeth being noble, at times.  I don't know how you'd make the case for Lady Macbeth.