Lets say I have red scorpion who is carrying a mage staff, can she use her fighting skill card "knight" to get the extra attack when she declares a battle action. The card states, "When you declare a Battle action, you may immediately spend 2 fatigue to gain movement points equal to half your speed (round up) and may make 3 attacks instead of 2 this turn." Any replies would be welcomed! Thanks!

Yes. No limit to the type of attacks is listed, so no limit to the type of attacks applies.

Appreciate James, I wasn't quite sure i you could use a mage type weapon using a fighting skill card. I figured it had to be a wizad skill card. That's great to know. Thanks again!

Just remember the mantra "Logic + Descent = Madness" and you should be fine.