• Whether you are or not, you sound like a real ass.

Once she is entitled to an opinion on something and believe it, its very difficult to get her to change her opinion.

That's probably because her opinion is already well thought out. And why wouldn't she be entitled to an opinion on something??

• As someone else rightly pointed out, she cannot give more than 100%.

I tend to give a few involuntary suggestions

• As far as your first point, you might try asking if she would like your opinion on a matter before you butt in. It sounds like you're micromanaging. It sounds like she's already told you she isn't seeking your advice. Which is probably why you're not having spur of the moment coffee with her either.
  

To the second point: does she come to you and say, "honey I'm making a decision and want to know what you think"? Or do you just tell her what you think she should do. Because, if the latter is the case, I would agree with her. That is rude. And it's kind of her to forgive you.