Why has my girlfriend started being pedantic and moaning?

right my Mrs is odd. Allow me to elaborate. She values being respected and says she hates 'feeling weak', but every day she calls up to moan about how 'shes cold' 'shes ill' or moans about something that I could be doing better. Like I said, 'ill get dinner when I see you, you like mcdonalds fishfinger sandwhiches, I'll get you one' and she just said... 'its not really a fishfinger sandwhich is it' and went onto explain why my definition of the crap she puts in her face wasn't called that in a tone of voice that said 'you too stupid to even understand a fishfinger sandwhich'. I'm thinking I should start being more strict with her, because she's a spastic and needs to be put in her place. Any suggestions as to why she's behaving liuke this. (I am quite nice to her by the way)
Why has my girlfriend started being pedantic and moaning?
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