Apprentice mission has only single botch die.
Chiurgy is not a combat ability. If you look at the list things that help during combat are included. The roll is high enough that anything would have succeeded, even something you defaulted, so little impact on that point.
The witch's wand must have been destroyed during the adventure, unless you take it as an adventure reward...
Adventures with multiple people are calculated normally. All involved get experience points the same as if it were solo. Rewards may be divided up as you see fit, but they are calculated from the overall adventure. Most choices may be applied to all (for example, confidence, labor point, virtues, and reputation will affect all involved)
hexed lady is also single botch die.
Also one success and 2 losses on a covenant story means 1 negative impact either for the character or the covenant, not one for each.