In What Way Does Lady Macbeth Change as the Play Develops

Lady Macbeth changes her behaviour a lot during the play Macbeth.
  At the first, she is very into killing Duncan, and this is the only thing she is interested in. She even asks G-d to take away all her female features and make her blood thick. I know this because of the quotations from the book.
“Unsex me here.” Along with, “Make thick my blood.” Also, “Come to my woman’s breasts and take my milk for your gall.”
She also says that she would kill her own baby if she had promised, just like Macbeth promised to help her with the murder of Duncan.
“I would, whilst it was smiling in my face, have plucked my nipple from his boneless gum, and dashed the brains out!”
  However, when Lady Macbeth arrives at the palace, ready to murder Duncan, she looks at him, and decides that he resembles her father too much, so she cannot kill him.
I find this behaviour slightly strange, as she says not too soon before that she would kill her own baby if she promised to. Now, she is not killing the king as he looks like her father, even though she promised to.
  This shows that although Lady Macbeth seems like she has no weakness or fear, she cannot in fact bring herself to kill someone that looks like a member of her family.
  Once Macbeth has killed Duncan he starts to regret it, however, Lady Macbeth says that if you just have a little wash, then you will be fine, and you can forget about it, and what is done, is done.
  She then realises that in order to be queen, she must order Macbeth to kill Banquo as well, as then, the thrown is clear for Macbeth to own. Of course, he obeys her.
  Later on in the play, Lady Macbeth is so guilty for killing Duncan, the guards and Banquo, that she starts to sleep walk and talk. She says some very strange things to do with not being able to wash off all the guilt, and still having blood on her hands.
“Yet here’s a spot.” Followed by, “Who would have thought the old man to have so much blood in him?” Then, “Will these hands never...