She may be fighting an infection. Usually the stitches do not hurt or itch much at all.
Metacam can cause digestive upset in some dogs which is why it needs to be given with food. Even then certain dogs can be bothered.
You can read about metacam here
http://www.veterinarypartner.com/Content.plx?P=A&A=1752&S=1&SourceID=52
If she seems worse you should consider going to the vet with her.
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